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| Value | Definition |
|---|---|
| H2O | water |
| Jb | Coast Range ophiolite, basalt |
| Jgb | Coast Range ophiolite, gabbro |
| Jsv | Keratophyre and quartz keratophyre tuff |
| KJfm | Metagraywacke (Cretaceous(?) and Jurassic) |
| KJfm? | Metagraywacke (Cretaceous(?) and Jurassic), identification uncertain |
| KJgv | Sandstone and shale (Early Cretaceous and Late Jurassic) |
| Kcs | Massive sandstone (Cretaceous) |
| Kfs | Sandstone (Late Cretaceous) |
| Kgvn | Novato conglomerate |
| Ku | Undivided sandstone, siltstone, and shale (Late Cretaceous) |
| Ku? | Undivided sandstone, siltstone, and shale (Late Cretaceous), identification uncertain |
| Kuh | Massive sandstone (Late Cretaceous) |
| Kus | Sandstone, siltstone, and shale (Late Cretaceous) |
| QTh | Huichica Formation |
| QThg | Huichica and Glen Ellen Formations, undivided |
| QThg? | Huichica and Glen Ellen Formations, undivided, identification uncertain |
| QTu | Sandstone, siltstone, and gravel (early Pleistocene and late Pliocene) |
| Qa | Alluvium (Holocene and late Pleistocene) |
| Qf | Alluvial fan deposits (Holocene and late Pleistocene) |
| Qha | Alluvium (Holocene) |
| Qhb | Basin deposits (Holocene) |
| Qhbm | Bay mud (Holocene) |
| Qhc | Stream channel deposits (Holocene) |
| Qhf | Alluvial fan deposits (Holocene) |
| Qhff | Fine-grained alluvial fan deposits (Holocene) |
| Qhfp | Floodplain deposits (Holocene) |
| Qhl | Natural levee deposits (Holocene) |
| Qls | Landslide deposits |
| Qoa | Alluvium (late and early Pleistocene) |
| Qop | Pediment deposits (late and early Pleistocene) |
| Qpf | Alluvial fan deposits (late Pleistocene) |
| Tbh | Briones Sandstone, Hambre shale member |
| Tbl | Briones Sandstone, lower member |
| Tbr | Briones Sandstone |
| Tbu | Briones Sandstone, upper member |
| Tc | Cierbo Sandstone |
| Tcc | Claremont Shale |
| Tcc? | Claremont Shale, identification uncertain |
| Tcgl | Conglomerate (late Miocene) |
| Td | Domingene Sandstone |
| Td? | Domingene Sandstone, identification uncertain |
| Tdi | Diatomite (middle to early Miocene) |
| Tdm | Donall Ranch volcanics of Youngman (1989), mafic member |
| Tdr | Donall Ranch volcanics of Youngman (1989), rhyolite member |
| Teh | Escobar Sandstone of Weaver (1953), basal shale member |
| Tes | Escobar Sandstone of Weaver (1953) |
| Th | Hambre Sandstone |
| Tl | Lawlor Tuff |
| Tlj | Las Juntas Shale of Weaver (1953) |
| Tljl | Las Juntas Shale of Weaver (1953), lower member |
| Tlju | Las Juntas Shale of Weaver (1953), upper member |
| Tm | Meganos Formation |
| Tmk | Markley Sandstone |
| Tmk? | Markley Sandstone, identification uncertain |
| Tmkj | Markley Sandstone, Jameson shale member |
| Tmkl | Markley Sandstone, lower member |
| Tmr | Muir Sandstone of Weaver (1953) |
| Tmr? | Muir Sandstone of Weaver (1953), identification uncertain |
| Tmrl | Muir Sandstone of Weaver (1953), lower member |
| Tmru | Muir Sandstone of Weaver (1953), upper member |
| Tmz | Martinez Formation |
| Tmz? | Martinez Formation, identification uncertain |
| Tn | Neroly Sandstone |
| Tnv | Nortonville Shale Member of Kreyenhagen Formation |
| Tor | Orinda Formation |
| Tpc | Petaluma Formation, claystone member |
| Tps | Petaluma Formation, mudrock, sandstone, and conglomerate member |
| Tps? | Petaluma Formation, mudrock, sandstone, and conglomerate member, identification uncertain |
| Tpt | Pinole Tuff |
| Tpth | Tehama Formation |
| Tr | Rodeo Shale |
| Ts | Sobrante Sandstone |
| Tsa | Sandstone (middle to early Miocene) |
| Tsr | San Ramon Sandstone |
| Tsv | Sonoma Volcanics |
| Tsva | Sonoma Volcanics, andesite to basalt flows |
| Tsva? | Sonoma Volcanics, andesite to basalt flows, identifiction uncertain |
| Tsvr | Sonoma Volcanics, rhyolite flows |
| Tsvr? | Sonoma Volcanics, rhyolite flows, identification uncertain |
| Tsvri | Sonoma Volcanics, rhyolite plugs and dikes |
| Tsvs | Sonoma Volcanics, volcanic sandstone, siltstone, and conglomerate |
| Tsvs? | Sonoma Volcanics, volcanic sandstone, siltstone, and conglomerate, identification uncertain |
| Tsvt | Sonoma Volcanics, ash-flow tuff |
| Tsvt? | Sonoma Volcanics, ash-flow tuff, identification uncertain |
| Tsvw | Sonoma Volcanics, welded ash-flow tuff |
| Tsvw? | Sonoma Volcanics, welded ash-flow tuff, identification uncertain |
| Tt | Tice Shale |
| Tut | Tuffaceous sandstone (late Miocene) |
| Tv | Cierbo Sandstone, intercalated basalt |
| Tvh | Vine Hill Sandstone of Weaver (1953) |
| Tvh? | Vine Hill Sandstone of Weaver (1953), identification uncertain |
| Tvhl | Vine Hill Sandstone of Weaver (1953), lower member |
| Tvhu | Vine Hill Sandstone of Weaver (1953), upper member |
| ac | Artificial channel deposits |
| af | Artificial fill |
| afbm | Artificial fill over Bay mud |
| alf | Artificial levee fill |
| fsr | Melange |
| ls | Limestone (age unknown) |
| sc | Silica-carbonate rock |
| sp | Coast Range ophiolite, serpentinite |
| Value | Definition |
|---|---|
| contact, approx. located | Boundary between two mapped units that retains the original depositional or intrusive relationship (i.e. not faulted). The contact has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 2 mm at map scale (1:62,500) or within about 125 meters on the ground. |
| contact, certain | Boundary between two mapped units that retains the original depositional or intrusive relationship (i.e. not faulted). The contact has been observed or is closely constrained, so it is well-located as described in Positional_Accuracy. |
| contact, concealed | Boundary between two mapped units that retains the original depositional or intrusive relationship (i.e. not faulted). The contact is obscured by overlying mapped units, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 5 mm at map scale (1:62,500) or within about 312 meters on the ground. |
| contact, inferred | Boundary between two mapped units that retains the original depositional or intrusive relationship (i.e. not faulted). The contact has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 5 mm at map scale (1:62,500) or within about 312 meters on the ground. The existence of the fault is inferred from structural and stratigraphic relationships observed elsewhere. |
| fault, approx. located | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset between the rock bodies on either side of the fault. The contact has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 2 mm at map scale (1:62,500) or within about 125 meters on the ground. |
| fault, certain | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset between the rock bodies on either side of the fault. The fault has been observed or is closely constrained, so it is well-located as described in Positional_Accuracy. |
| fault, concealed | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset between the rock bodies on either side of the fault. The fault is obscured by overlying mapped units, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 5 mm at map scale (1:62,500) or within about 312 meters on the ground. |
| fault, concealed, queried | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset between the rock bodies on either side of the fault. The fault is obscured by overlying mapped units, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 10 mm at map scale (1:62,500) or within about 625 meters on the ground. |
| fault, inferred | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset between the rock bodies on either side of the fault. The fault has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 5 mm at map scale (1:62,500) or within about 312 meters on the ground. The existence of the fault is inferred from structural and stratigraphic relationships observed elsewhere. |
| map boundary | Edge of the mapped area. Used primarily to bound polygons at the edge of the map database. The location of the boundary is well located as described in Positional_Accuracy |
| reverse fault, approx. located | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced reverse offset between the rock bodies on either side of the fault. The fault has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 2 mm at map scale (1:62,500) or within about 125 meters on the ground. |
| reverse fault, certain | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced reverse offset between the rock bodies on either side of the fault. The fault has been observed or is closely constrained, so it is well-located as described in Positional_Accuracy. |
| reverse fault, concealed | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced reverse offset between the rock bodies on either side of the fault. The fault is obscured by overlying mapped units, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 5 mm at map scale (1:62,500) or within about 312 meters on the ground. |
| thrust fault, approx. located | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced thrust offset between the rock bodies on either side of the fault. The fault has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 2 mm at map scale (1:62,500) or within about 125 meters on the ground. |
| thrust fault, certain | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced thrust offset between the rock bodies on either side of the fault. The fault has been observed or is closely constrained, so it is well-located as described in Positional_Accuracy. |
| thrust fault, concealed | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced thrust offset between the rock bodies on either side of the fault. The fault is obscured by overlying mapped units, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 5 mm at map scale (1:62,500) or within about 312 meters on the ground. |
| thrust fault, inferred | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced thrust offset between the rock bodies on either side of the fault. The fault has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 5 mm at map scale (1:62,500) or within about 312 meters on the ground. The existence of the fault is inferred from structural and stratigraphic relationships observed elsewhere. |
| water boundary | The edge of a mapped body of water. This line is derived from the base map, and therefore is well-located as described in Positional_Accuracy. |
| Value | Definition |
|---|---|
| H2O | water |
| Jk | Knoxville Formation |
| Jv | Basalt and keratophyre |
| KJfm? | Metagraywacke (Cretaceous(?) and Jurassic), identification uncertain |
| KJgv | Sandstone and shale (Early Cretaceous and Late Jurassic) |
| KJgvm | Sandstone- and shale-matrix melange |
| KJu | Sandstone and shale (Early Cretaceous and Late Jurassic), sandstone member |
| Kf | Funks Formation |
| Kfo | Forbes Formation |
| Kg | Guinda Formation |
| Ks | Sites Formation |
| Ksh | Sandstone and shale (Late Cretaceous), siliceous shale member |
| Kuhs | Sandstone and shale (Late Cretaceous) |
| Kuss | Sandstone and shale (Late Cretaceous), sandstone member |
| Kuss? | Sandstone and shale (Late Cretaceous), sandstone member, identification uncertain |
| Kv | Venado Formation |
| Ky | Yolo Formation |
| Qa | Alluvium (Holocene and late Pleistocene) |
| Qf | Alluvial fan deposits (Holocene and late Pleistocene) |
| Qha | Alluvium (Holocene) |
| Qhb | Basin deposits (Holocene) |
| Qhc | Stream channel deposits (Holocene) |
| Qhf | Alluvial fan deposits (Holocene) |
| Qhfb | Floodbasin deposits (Holocene) |
| Qhff | Fine-grained alluvial fan deposits (Holocene) |
| Qhl | Natural levee deposits (Holocene) |
| Qht | Terrace deposits (Holocene) |
| Qls | Landslide deposits |
| Qoa | Alluvium (late and early Pleistocene) |
| Qpb | Basin deposits (late Pleistocene) |
| Qpf | Alluvial fan deposits (late Pleistocene) |
| Qt | Terrace deposits (Holocene and late Pleistocene) |
| Td | Domingene Sandstone |
| Tmk | Markley Sandstone |
| Tn | Neroly Sandstone |
| Tn? | Neroly Sandstone, identification uncertain |
| Tnv | Nortonville Shale Member of Kreyenhagen Formation |
| Tnvl | Nortonville Shale Member of Kreyenhagen Formation, lower member |
| Tnvm | Nortonville Shale Member of Kreyenhagen Formation, middle member |
| Tnvu | Nortonville Shale Member of Kreyenhagen Formation, upper member |
| Tpb | Putnam Peak Basalt |
| Tpth | Tehama Formation |
| Tptt | Tehama Formation, Putah Tuff member |
| Tpu | Shale and sandstone (Paleocene) |
| Tpus | Shale and sandstone (Paleocene), basal sandstone member |
| Tsh | Shale (Eocene) |
| Tsv | Sonoma Volcanics |
| Tsva | Sonoma Volcanics, andesite to basalt flows |
| Tsva? | Sonoma Volcanics, andesite to basalt flows, identification uncertain |
| Tsvad | Sonoma Volcanics, andesite to dacite flows |
| Tsvd | Sonoma Volcanics, diatomite |
| Tsvl | Sonoma Volcanics, lithic tuff |
| Tsvp | Sonoma Volcanics, rhyolite and perlitic flows and plugs |
| Tsvr | Sonoma Volcanics, rhyolite flows |
| Tsvr? | Sonoma Volcanics, rhyolite flows, identification uncertain |
| Tsvri | Sonoma Volcanics, rhyolite plugs and dikes |
| Tsvs | Sonoma Volcanics, volcanic sandstone, siltstone, and conglomerate |
| Tsvt | Sonoma Volcanics, ash-flow tuff |
| Tsvw | Sonoma Volcanics, welded ash-flow tuff |
| af | Artificial fill |
| afbm | Artificial fill over Bay mud |
| alf | Artificial levee fill |
| sp | Coast Range ophiolite, serpentinite |
| sp? | Coast Range ophiolite, serpentinite, identification uncertain |
| Value | Definition |
|---|---|
| contact, approx. located | Boundary between two mapped units that retains the original depositional or intrusive relationship (i.e. not faulted). The contact has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 2 mm at map scale (1:62,500) or within about 125 meters on the ground. |
| contact, certain | Boundary between two mapped units that retains the original depositional or intrusive relationship (i.e. not faulted). The contact has been observed or is closely constrained, so it is well-located as described in Positional_Accuracy. |
| contact, gradational | Boundary between two mapped units that retains the original depositional or intrusive relationship (i.e. not faulted). The contact is gradational (lacking a distinct position, but rather marking a gradual change in rock character), so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 5 mm at map scale (1:62,500) or within about 312 meters on the ground. |
| fault, approx. located | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset between the rock bodies on either side of the fault. The contact has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 2 mm at map scale (1:62,500) or within about 125 meters on the ground. |
| fault, certain | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset between the rock bodies on either side of the fault. The fault has been observed or is closely constrained, so it is well-located as described in Positional_Accuracy. |
| fault, concealed | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset between the rock bodies on either side of the fault. The fault is obscured by overlying mapped units, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 5 mm at map scale (1:62,500) or within about 312 meters on the ground. |
| fault, concealed, queried | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset between the rock bodies on either side of the fault. The fault is obscured by overlying mapped units, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 10 mm at map scale (1:62,500) or within about 625 meters on the ground. |
| fault, inferred | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset between the rock bodies on either side of the fault. The fault has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 5 mm at map scale (1:62,500) or within about 312 meters on the ground. The existence of the fault is inferred from structural and stratigraphic relationships observed elsewhere. |
| map boundary | Edge of the mapped area. Used primarily to bound polygons at the edge of the map database. The location of the boundary is well located as described in Positional_Accuracy |
| scratch boundary | An arbitrary line. Used primarily to divide large polygons that exceed ArcInfo specifications. The location of the boundary is arbitrary |
| water boundary | The edge of a mapped body of water. This line is derived from the base map, and therefore is well-located as described in Positional_Accuracy. |
| Value | Definition |
|---|---|
| H2O | water |
| Jv | Basalt and keratophyre |
| KJfm? | Metagraywacke (Cretaceous(?) and Jurassic), identification uncertain |
| KJgv | Sandstone and shale (Early Cretaceous and Late Jurassic) |
| KJgvm | Sandstone- and shale-matrix melange |
| Kf | Funks Formation |
| Kfo | Forbes Formation |
| Kg | Guinda Formation |
| Ks | Sites Formation |
| Ksh | Sandstone and shale (Late Cretaceous), siliceous shale member |
| Kuss | Sandstone and shale (Late Cretaceous), sandstone member |
| Kuss? | Sandstone and shale (Late Cretaceous), sandstone member, identification uncertain |
| Kv | Venado Formation |
| Ky | Yolo Formation |
| Qa | Alluvium (Holocene and late Pleistocene) |
| Qha | Alluvium (Holocene) |
| Qhay | Younger alluvium (late Holocene) |
| Qhb | Basin deposits (Holocene) |
| Qhc | Stream channel deposits (Holocene) |
| Qhf | Alluvial fan deposits (Holocene) |
| Qhl | Natural levee deposits (Holocene) |
| Qls | Landslide deposits |
| Qoa | Alluvium (late and early Pleistocene) |
| Qpa | Alluvium (late Pleistocene) |
| Tpb | Putnam Peak Basalt |
| Tpth | Tehama Formation |
| Tptt | Tehama Formation, Putah Tuff member |
| Tpu | Shale and sandstone (Paleocene) |
| Tsh | Shale (Eocene) |
| af | Artificial fill |
| alf | Artificial levee fill |
| sp | Coast Range ophiolite, serpentinite |
| Value | Definition |
|---|---|
| contact, approx. located | Boundary between two mapped units that retains the original depositional or intrusive relationship (i.e. not faulted). The contact has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 2 mm at map scale (1:62,500) or within about 125 meters on the ground. |
| contact, certain | Boundary between two mapped units that retains the original depositional or intrusive relationship (i.e. not faulted). The contact has been observed or is closely constrained, so it is well-located as described in Positional_Accuracy. |
| contact, gradational | Boundary between two mapped units that retains the original depositional or intrusive relationship (i.e. not faulted). The contact is gradational (lacking a distinct position, but rather marking a gradual change in rock character), so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 5 mm at map scale (1:62,500) or within about 312 meters on the ground. |
| county line | Edge of a county. Used primarily to bound polygons at the edge of a county where sources of map data vary. The location of the boundary is well located as described in Positional_Accuracy |
| fault, approx. located | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset between the rock bodies on either side of the fault. The contact has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 2 mm at map scale (1:62,500) or within about 125 meters on the ground. |
| fault, certain | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset between the rock bodies on either side of the fault. The fault has been observed or is closely constrained, so it is well-located as described in Positional_Accuracy. |
| fault, concealed | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset between the rock bodies on either side of the fault. The fault is obscured by overlying mapped units, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 5 mm at map scale (1:62,500) or within about 312 meters on the ground. |
| fault, concealed, queried | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset between the rock bodies on either side of the fault. The fault is obscured by overlying mapped units, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 10 mm at map scale (1:62,500) or within about 625 meters on the ground. |
| map boundary | Edge of the mapped area. Used primarily to bound polygons at the edge of the map database. The location of the boundary is well located as described in Positional_Accuracy |
| marker bed | Map trace of a conglomerate or tuff marker bed too small to map as a separate polygon. The location of the marker bed is well located as described in Positional_Accuracy |
| water boundary | The edge of a mapped body of water. This line is derived from the base map, and therefore is well-located as described in Positional_Accuracy. |
| Value | Definition |
|---|---|
| H2O | water |
| Kuhs? | Sandstone and shale (Late Cretaceous), identification uncertain |
| QTu | Sandstone, siltstone, and gravel (early Pleistocene and late Pliocene) |
| Qa | Alluvium (Holocene and late Pleistocene) |
| Qds | Dune sands (early Holocene and latest Pleistocene) |
| Qds? | Dune sands (early Holocene and latest Pleistocene), identification uncertain |
| Qf | Alluvial fan deposits (Holocene and late Pleistocene) |
| Qha | Alluvium (Holocene) |
| Qhay | Younger alluvium (late Holocene) |
| Qhb | Basin deposits (Holocene) |
| Qhbm | Bay mud (Holocene) |
| Qhc | Stream channel deposits (Holocene) |
| Qhdm | Delta mud deposits (Holocene) |
| Qhf | Alluvial fan deposits (Holocene) |
| Qhfb | Floodbasin deposits (Holocene) |
| Qhl | Natural levee deposits (Holocene) |
| Qhl? | Natural levee deposits (Holocene), identification uncertain |
| Qls | Landslide deposits |
| Qmz | Montezuma Formation |
| Qoa | Alluvium (late and early Pleistocene) |
| Qoa? | Alluvium (late and early Pleistocene), identification uncertain |
| Qop | Pediment deposits (late and early Pleistocene) |
| Qpf | Alluvial fan deposits (late Pleistocene) |
| Tc | Cierbo Sandstone |
| Td | Domingene Sandstone |
| Tl | Lawlor Tuff |
| Tmk | Markley Sandstone |
| Tmk? | Markley Sandstone, identification uncertain |
| Tmkl | Markley Sandstone, lower member |
| Tmku | Markley Sandstone, upper member |
| Tmz | Martinez Formation |
| Tn | Neroly Sandstone |
| Tn? | Neroly Sandstone, identification uncertain |
| Tnv | Nortonville Shale Member of Kreyenhagen Formation |
| Tpth | Tehama Formation |
| Tpu | Shale and sandstone (Paleocene) |
| Tsh | Shale (Eocene) |
| ac | Artificial channel deposits |
| ads | Dredge spoils |
| af | Artificial fill |
| afbm | Artificial fill over Bay mud |
| alf | Artificial levee fill |
| Value | Definition |
|---|---|
| contact, approx. located | Boundary between two mapped units that retains the original depositional or intrusive relationship (i.e. not faulted). The contact has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 2 mm at map scale (1:62,500) or within about 125 meters on the ground. |
| contact, certain | Boundary between two mapped units that retains the original depositional or intrusive relationship (i.e. not faulted). The contact has been observed or is closely constrained, so it is well-located as described in Positional_Accuracy. |
| contact, inferred | Boundary between two mapped units that retains the original depositional or intrusive relationship (i.e. not faulted). The contact has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 5 mm at map scale (1:62,500) or within about 312 meters on the ground. The existence of the fault is inferred from structural and stratigraphic relationships observed elsewhere. |
| county line | Edge of a county. Used primarily to bound polygons at the edge of a county where sources of map data vary. The location of the boundary is well located as described in Positional_Accuracy |
| fault, approx. located | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset between the rock bodies on either side of the fault. The contact has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 2 mm at map scale (1:62,500) or within about 125 meters on the ground. |
| fault, certain | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset between the rock bodies on either side of the fault. The fault has been observed or is closely constrained, so it is well-located as described in Positional_Accuracy. |
| fault, concealed | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset between the rock bodies on either side of the fault. The fault is obscured by overlying mapped units, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 5 mm at map scale (1:62,500) or within about 312 meters on the ground. |
| fault, concealed, queried | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset between the rock bodies on either side of the fault. The fault is obscured by overlying mapped units, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 10 mm at map scale (1:62,500) or within about 625 meters on the ground. |
| fault, inferred | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset between the rock bodies on either side of the fault. The fault has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 5 mm at map scale (1:62,500) or within about 312 meters on the ground. The existence of the fault is inferred from structural and stratigraphic relationships observed elsewhere. |
| map boundary | Edge of the mapped area. Used primarily to bound polygons at the edge of the map database. The location of the boundary is well located as described in Positional_Accuracy |
| scratch boundary | An arbitrary line. Used primarily to divide large polygons that exceed ArcInfo specifications. The location of the boundary is arbitrary |
| thrust fault, concealed | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced thrust offset between the rock bodies on either side of the fault. The fault is obscured by overlying mapped units, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 5 mm at map scale (1:62,500) or within about 312 meters on the ground. |
| water boundary | The edge of a mapped body of water. This line is derived from the base map, and therefore is well-located as described in Positional_Accuracy. |
| Value | Definition |
|---|---|
| approx bedding | Originally horizontal sedimentary layers were observed at this point. Because of poor exposure, weathering, indistinct layering, or some other factor, only the approximate orientation of the layers was measured. |
| bedding | Originally horizontal sedimentary layers were observed at this point. |
| bedding w/tops | Originally horizontal sedimentary layers were observed at this point. In addition, a geopedal indicator was observed that showed the beds were upright. |
| foliation | Metamorphic foliation was observed at this point. |
| horz joint | A horizontal rock fracture without apparent offset was observed at this point. |
| joint | A rock fracture without apparent offset was observed at this point. |
| ot bedding | Originally horizontal sedimentary layers were observed at this point. Evidence that the beds are overturned was observed, although that observation may not have been made at this point. |
| ot bedding w/tops | Originally horizontal sedimentary layers were observed at this point. In addition, a geopedal indicator was observed that showed the beds were overturned. |
| vert bedding | Originally horizontal sedimentary layers were observed at this point. These layers are now vertical. |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 90 |
| Units: | degrees |
| Resolution: | 1 |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 359 |
| Units: | degrees |
| Resolution: | 1 |
| Value | Definition |
|---|---|
| f.a., anticline, approx. located | Fold axis of an anticline. The axis has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 2 mm at map scale (1:62,500) or within about 125 meters on the ground. |
| f.a., anticline, certain | Fold axis of an anticline. The axis has been observed or is closely constrained, so it is well-located as described in Positional_Accuracy. |
| f.a., anticline, concealed | Fold axis of an anticline. The axis is obscured by overlying mapped units, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 5 mm at map scale (1:62,500) or within about 312 meters on the ground. |
| f.a., syncline, approx.located | Fold axis of a syncline. The axis has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 2 mm at map scale (1:62,500) or within about 125 meters on the ground. |
| f.a., syncline, certain | Fold axis of a syncline. The axis has been observed or is closely constrained, so it is well-located as described in Positional_Accuracy. |
| f.a., syncline, concealed | Fold axis of a syncline. The axis is obscured by overlying mapped units, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 5 mm at map scale (1:62,500) or within about 312 meters on the ground. |
| map boundary | Edge of the mapped area. The location of the boundary is well located as described in Positional_Accuracy |
| Value | Definition |
|---|---|
| Allendale | Allendale7.5' quadrangle |
| Antioch North | Antioch North 7.5' quadrangle |
| Benicia | Benicia7.5' quadrangle |
| Birds Landing | Birds Landing 7.5' quadrangle |
| Bouldin Island | Bouldin Island 7.5' quadrangle |
| Brooks | Brooks 7.5' quadrangle |
| Capell Valley | Capell Valley 7.5' quadrangle |
| Cordelia | Cordelia7.5' quadrangle |
| Cuttings Wharf | Cuttings Wharf 7.5' quadrangle |
| Denverton | Denverton 7.5' quadrangle |
| Dixon | Dixon7.5' quadrangle |
| Dozier | Dozier7.5' quadrangle |
| Elmira | Elmira 7.5' quadrangle |
| Esparto | Esparto7.5' quadrangle |
| Fairfield North | Fairfield North 7.5' quadrangle |
| Fairfield South | Fairfield South 7.5' quadrangle |
| Honker Bay | Honker Bay 7.5' quadrangle |
| Isleton | Isleton7.5' quadrangle |
| Jersey Island | Jersey Island 7.5' quadrangle |
| Lake Berryessa | Lake Berryessa 7.5' quadrangle |
| Madison | Madison7.5' quadrangle |
| Mare Island | Mare Island 7.5' quadrangle |
| Merrit | Merrit 7.5' quadrangle |
| Monticello Dam | Monticello Dam 7.5' quadrangle |
| Mount George | Mount George 7.5' quadrangle |
| Mount Vaca | Mount Vaca 7.5' quadrangle |
| Petaluma Point | Petaluma Point 7.5' quadrangle |
| Rio Vista | Rio Vista 7.5' quadrangle |
| Sears Point | Sears Point 7.5' quadrangle |
| Vine Hill | Vine Hill 7.5' quadrangle |
| Winters | Winters 7.5' quadrangle |
| Woodland | Woodland 7.5' quadrangle |
| Value | Definition |
|---|---|
| quad boundary | Edge of a USGS 7.5-minute quadrangle in the map area. This line is derived from a 7.5-minute grid generated from latitude and longitude values and therefore should be precisely located. |
| Value | Definition |
|---|---|
| Jb | Coast Range ophiolite, basalt |
| Jgb | Coast Range ophiolite, gabbro |
| Jk | Knoxville Formation |
| Jsv | Keratophyre and quartz keratophyre tuff |
| Jv | Coast Range ophiolite, basalt and keratophyre |
| KJfm | Metagraywacke (Cretaceous(?) and Jurassic) |
| KJgv | Sandstone and shale (Early Cretaceous and Late Jurassic) |
| KJgvm | Sandstone- and shale-matrix melange |
| KJu | Sandstone and shale (Early Cretaceous and Late Jurassic), sandstone member |
| Kcs | Massive sandstone (Cretaceous) |
| Kf | Funks Formation |
| Kfo | Forbes Formation |
| Kfs | Sandstone (Late Cretaceous) |
| Kg | Guinda Formation |
| Kgvn | Novato conglomerate |
| Ks | Sites Formation |
| Ksh | Sandstone and shale (Late Cretaceous), siliceous shale member |
| Ku | Undivided sandstone, siltstone, and shale (Late Cretaceous) |
| Kuh | Massive sandstone (Late Cretaceous) |
| Kuhs | Sandstone and shale (Late Cretaceous) |
| Kus | Sandstone, siltstone, and shale (Late Cretaceous) |
| Kuss | Sandstone and shale (Late Cretaceous), sandstone member |
| Kv | Venado Formation |
| Ky | Yolo Formation |
| QTh | Huichica Formation |
| QThg | Huichica and Glen Ellen Formations, undivided |
| QTu | Sandstone, siltstone, and gravel (early Pleistocene and late Pliocene) |
| Qa | Alluvium (Holocene and late Pleistocene) |
| Qds | Dune sands (early Holocene and latest Pleistocene) |
| Qf | Alluvial fan deposits (Holocene and late Pleistocene) |
| Qha | Alluvium (Holocene) |
| Qhay | Younger alluvium (late Holocene) |
| Qhb | Basin deposits (Holocene) |
| Qhbm | Bay mud (Holocene) |
| Qhc | Stream channel deposits (Holocene) |
| Qhdm | Delta mud (Holocene) |
| Qhf | Alluvial fan deposits (Holocene) |
| Qhfb | Floodbasin deposits (Holocene) |
| Qhff | Fine-grained alluvial fan deposits (Holocene) |
| Qhfp | Floodplain deposits (Holocene) |
| Qhl | Natural levee deposits (Holocene) |
| Qht | Terrace deposits (Holocene) |
| Qls | Landslide deposits |
| Qmz | Montezuma Formation |
| Qoa | Alluvium (late and early Pleistocene) |
| Qop | Pediment deposits (late and early Pleistocene) |
| Qpa | Alluvium (late Pleistocene) |
| Qpf | Alluvial fan deposits (late Pleistocene) |
| Qt | Terrace deposits (Holocene and late Pleistocene) |
| Tbh | Briones Sandstone, Hambre shale member |
| Tbl | Briones Sandstone, lower member |
| Tbr | Briones Sandstone |
| Tbu | Briones Sandstone, upper member |
| Tc | Cierbo Sandstone |
| Tcc | Claremont Shale |
| Tcgl | Conglomerate (late Miocene) |
| Td | Domingene Sandstone |
| Tdi | Diatomite (middle to early Miocene) |
| Tdm | Donall Ranch volcanics of Youngman (1989), mafic member |
| Tdr | Donall Ranch volcanics of Youngman (1989), rhyolite member |
| Teh | Escobar Sandstone of Weaver (1953), basal shale member |
| Tes | Escobar Sandstone of Weaver (1953) |
| Th | Hambre Sandstone |
| Tl | Lawlor Tuff |
| Tlj | Las Juntas Shale of Weaver (1953) |
| Tljl | Las Juntas Shale of Weaver (1953), lower member |
| Tlju | Las Juntas Shale of Weaver (1953), upper member |
| Tm | Meganos Formation |
| Tmk | Markley Sandstone |
| Tmkj | Markley Sandstone, Jameson shale member |
| Tmkl | Markley Sandstone, lower member |
| Tmku | Markley Sandstone, upper member |
| Tmr | Muir Sandstone of Weaver (1953) |
| Tmrl | Muir Sandstone of Weaver (1953), lower member |
| Tmru | Muir Sandstone of Weaver (1953), upper member |
| Tmz | Martinez Formation |
| Tn | Neroly Sandstone |
| Tnv | Nortonville Shale Member of Kreyenhagen Formation |
| Tnvl | Nortonville Shale Member of Kreyenhagen Formation, lower member |
| Tnvm | Nortonville Shale Member of Kreyenhagen Formation, middle member |
| Tnvu | Nortonville Shale Member of Kreyenhagen Formation, upper member |
| Tor | Orinda Formation |
| Tpb | Putnam Peak Basalt |
| Tpc | Petaluma Formation, claystone member |
| Tps | Petaluma Formation, mudrock, sandstone, and conglomerate member |
| Tpt | Pinole Tuff |
| Tpth | Tehama Formation |
| Tptt | Tehama Formation, Putah Tuff member |
| Tpu | Shale and sandstone (Pleistocene) |
| Tpus | Shale and sandstone (Pleistocene), basal sandstone member |
| Tr | Rodeo Shale |
| Ts | Sobrante Sandstone |
| Tsa | Sandstone (middle to early Miocene) |
| Tsh | Shale (Eocene) |
| Tsr | San Ramon Sandstone |
| Tsv | Sonoma Volcanics |
| Tt | Tice Shale |
| Tut | Tuffaceous sandstone (late Miocene) |
| Tv | Cierbo Sandstone, intercalated basalt |
| Tvh | Vine Hill Sandstone of Weaver (1953) |
| Tvhl | Vine Hill Sandstone of Weaver (1953), lower member |
| Tvhu | Vine Hill Sandstone of Weaver (1953), upper member |
| ac | Artificial channel deposits |
| ads | Dredge spoils |
| af | Artificial fill |
| afbm | Artificial fill over Bay mud |
| alf | Artificial levee fill |
| fsr | Melange |
| sc | Silica-carbonate rock |
| sp | Coast Range ophiolite, serpentinite |
| Value | Definition |
|---|---|
| bracket | Bracket line in the correlation chart to delineate age categories |
| box | Edge of a box in the correlation chart |
| box, approx. located | Edge of a box in the correlation chart representing a stratigraphic division of poorly constrained age |
| contact, certain | Edge of a box that represents a depositional contact between adjacent units |
| leader | Leader line in the correlation chart to enable labeling of small boxes |
| scratch boundary | Non-drawing line in the correlation chart to ensure annotation is entirely within the map boundary |
| Range of values | |
|---|---|
| Minimum: | 1 |
| Maximum: | 14 |
| Value | Definition |
|---|---|
| map boundary | The edge of the index map area. |
| source boundary | The boundary between regions within which different sources of data were used to supplement new mapping by the authors. The sources are delineated in Source_Information as well as plotfiles nesfmap.ps and nesfmap.pdf. This line is not well-located as described in Positional_Accuracy, and is included for general reference only. |
| Value | Definition |
|---|---|
| Area of Black Point assemblage | |
| Area of Cordelia assemblage | |
| Area of Hercules assemblage | |
| Area of Martinez assemblage | |
| Area of Pinole Point assemblage | |
| Area of Pittsburg assemblage | |
| Area of Rodeo assemblage | |
| Area of Sears Point assemblage | |
| Area of Sonoma assemblage | |
| Area of Vacaville assemblage | |
| Area of surficial deposits, water, or Franciscan Complex rocks |
| Value | Definition |
|---|---|
| contact, approx. located | Boundary between two mapped units that retains the original depositional or intrusive relationship (i.e. not faulted). The contact has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 2 mm at map scale (1:62,500) or within about 125 meters on the ground. |
| contact, certain | Boundary between two mapped units that retains the original depositional or intrusive relationship (i.e. not faulted). The contact has been observed or is closely constrained, so it is well-located as described in Positional_Accuracy. |
| fault, approx. located | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset between the rock bodies on either side of the fault. The fault has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 2 mm at map scale (1:62,500) or within about 125 meters on the ground. |
| fault, certain | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset between the rock bodies on either side of the fault. The fault has been observed or is closely constrained, so it is well-located as described in Positional_Accuracy. |
| fault, concealed | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset between the rock bodies on either side of the fault. The fault is obscured by overlying mapped units, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 5 mm at map scale (1:62,500) or within about 312 meters on the ground. |
| fault, inferred | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset between the rock bodies on either side of the fault. The fault has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 5 mm at map scale (1:62,500) or within about 312 meters on the ground. The existence of the fault is inferred from structural and stratigraphic relationships observed elsewhere. |
| map boundary | Edge of the mapped area. Used primarily to bound polygons at the edge of the map database. The location of the boundary is well located as described in Positional_Accuracy |
| reverse fault, approx. located | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced reverse offset between the rock bodies on either side of the fault. The fault has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 2 mm at map scale (1:62,500) or within about 125 meters on the ground. |
| reverse fault, certain | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced reverse offset between the rock bodies on either side of the fault. The fault has been observed or is closely constrained, so it is well-located as described in Positional_Accuracy. |
| reverse fault, concealed | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced reverse offset between the rock bodies on either side of the fault. The fault is obscured by overlying mapped units, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 5 mm at map scale (1:62,500) or within about 312 meters on the ground. |
| scratch boundary | An arbitrary line with no geologic or geographic significance. Used primarily to divide polygons that would otherwise have more vertices than allowed by Arc/Info. |
| thrust fault, approx. located | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced thrust offset between the rock bodies on either side of the fault. The fault has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 2 mm at map scale (1:62,500) or within about 125 meters on the ground. |
| thrust fault, inferred | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced thrust offset between the rock bodies on either side of the fault. The fault has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 5 mm at map scale (1:62,500) or within about 312 meters on the ground. The existence of the fault is inferred from structural and stratigraphic relationships observed elsewhere. |
| water boundary | The edge of a mapped body of water. This line is derived from the base map, and therefore is well-located as described in Positional_Accuracy. |
| Value | Definition |
|---|---|
| fault, approx. located | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset between the rock bodies on either side of the fault. The contact has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 2 mm at map scale (1:62,500) or within about 125 meters on the ground. |
| fault, certain | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset between the rock bodies on either side of the fault. The fault has been observed or is closely constrained, so it is well-located as described in Positional_Accuracy. |
| fault, concealed | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset between the rock bodies on either side of the fault. The fault is obscured by overlying mapped units, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 5 mm at map scale (1:62,500) or within about 312 meters on the ground. |
| fault, concealed, queried | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset between the rock bodies on either side of the fault. The fault is obscured by overlying mapped units, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 10 mm at map scale (1:62,500) or within about 625 meters on the ground. |
| fault, inferred | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset between the rock bodies on either side of the fault. The fault has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 5 mm at map scale (1:62,500) or within about 312 meters on the ground. The existence of the fault is inferred from structural and stratigraphic relationships observed elsewhere. |
| fault, inferred, queried | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced relative offset between the rock bodies on either side of the fault. The fault has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 10 mm at map scale (1:62,500) or within about 625 meters on the ground. The existence of the fault is inferred from structural and stratigraphic relationships observed elsewhere. |
| reverse fault, approx. located | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced reverse offset between the rock bodies on either side of the fault. The fault has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 2 mm at map scale (1:62,500) or within about 125 meters on the ground. |
| reverse fault, certain | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced reverse offset between the rock bodies on either side of the fault. The fault has been observed or is closely constrained, so it is well-located as described in Positional_Accuracy. |
| reverse fault, concealed | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced reverse offset between the rock bodies on either side of the fault. The fault is obscured by overlying mapped units, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 5 mm at map scale (1:62,500) or within about 312 meters on the ground. |
| thrust fault, approx. located | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced thrust offset between the rock bodies on either side of the fault. The fault has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 2 mm at map scale (1:62,500) or within about 125 meters on the ground. |
| thrust fault, certain | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced thrust offset between the rock bodies on either side of the fault. The fault has been observed or is closely constrained, so it is well-located as described in Positional_Accuracy. |
| thrust fault, concealed | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced thrust offset between the rock bodies on either side of the fault. The fault is obscured by overlying mapped units, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 5 mm at map scale (1:62,500) or within about 312 meters on the ground. |
| thrust fault, inferred | Structural boundary between mapped units or structural discontinuity within a mapped unit that has experienced thrust offset between the rock bodies on either side of the fault. The fault has not been observed, so it is not well-located as described in Positional_Accuracy, but the location is constrained to be within about 5 mm at map scale (1:62,500) or within about 312 meters on the ground. The existence of the fault is inferred from structural and stratigraphic relationships observed elsewhere. |
| Value | Definition |
|---|---|
| Concord Fault | Segment belongs to the Concord Fault |
| Cordelia Fault | Segment belongs to the Cordelia Fault |
| Franklin Canyon Fault | Segment belongs to the Franklin Canyon Fault |
| Green Valley Fault | Segment belongs to the Green Valley Fault |
| Hayward Fault | Segment belongs to the Hayward Fault |
| Lake Herman Fault | Segment belongs to the Lake Herman Fault |
| Pinole Fault | Segment belongs to the Pinole Fault |
| Rodgers Creek Fault | Segment belongs to the Rodgers Creek Fault |
| Southampton Fault | Segment belongs to the Southampton Fault |
| Sky Valley Fault | Segment belongs to the Sky Valley Fault |
| Tolay Fault | Segment belongs to the Tolay Fault |
| Wragg Canyon Fault | Segment belongs to the Wragg Canyon Fault |
We would like to acknowledge our many colleagues at the USGS, University of California, and Stanford University for their many contributions over the years. We are grateful to the following U.S. Geological Survey paleontologists who have examined our fossils and provided ages necessary to establish the stratigraphic sequence and structure: David Bukry (Cretaceous and Tertiary nannoplankton), Kristin McDougall (Tertiary foraminifers), William Sliter (Cretaceous and Eocene foraminifers), John Barron (Tertiary diatoms), Charles Powell, II (Tertiary mollusks), and Benita Murchey (Mesozoic radiolaria). We are also very grateful to managers and staff of Chevron, EXXON, UNOCAL, ARCO, and Shell Petroleum Companies who have provided reports, maps, picked slides, and residues for about 25,000 microfossil localities in the San Francisco Bay Region. Finally, we are indebted to Roland Tabor and Andrei Sarna-Wojcicki for their thorough reviews of the manuscript for this report, as well as Charles Powell, II, for his review of stratigraphic nomenclature and Scott Graham for his review of the digital database.
This database and accompanying plot files depict the distribution of geologic materials and structures at a regional (1:62,500) scale. The report is intended to provide geologic information for the regional study of materials properties, earthquake shaking, landslide potential, mineral hazards, seismic velocity, and earthquake faults. In addition, the report contains new information and interpretations about the regional geologic history and framework. However, the regional scale of this report does not provide sufficient detail for site development purposes. In addition, this map does not take the place of fault-rupture hazard zones designated by the California State Geologist (Hart and Bryant, 1999). Similarly, the database cannot be used to identify or delineate landslides in the region.
Are there legal restrictions on access or use of the data?Access_Constraints: None
Use_Constraints:Uses of this digital geologic map should not violate the spatial resolution of the data. Although the digital form of the data removes the constraint imposed by the scale of a paper map, the detail and accuracy inherent in map scale are also present in the digital data. The fact that this database was edited for a scale of 1:62,500 means that higher resolution information is not present in the dataset. Plotting at scales larger than 1:62,500 will not yield greater real detail, although it may reveal fine-scale irregularities below the intended resolution of the database. Similarly, where this database is used in combination with other data of higher resolution, the resolution of the combined output will be limited by the lower resolution of these data.
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this publication has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.
| Data format: | Geologic units and structural features in format ARCE (version 7.2.1) Size: 6.3 |
|---|---|
| Network links: |
http://pubs.usgs.gov/mf/2002/2403/mf2403c.tgz |
