1. Materials properties 2. Earthquake shaking 3. Liquefaction potential 4. Ground water pollution 5. Relating landslides 6. Location of mineral hazards 7. Seismic velocity 8. Earthquake faults 9. Education and scientific inquiry
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| Value | Definition |
|---|---|
| 'Butano Ridge Assemblage' | |
| 'Mindego Hill Assemblage' | |
| 'Montara Mountain Assemblage' | |
| 'Pacifica Assemblage' | |
| 'Pigeon Point Assemblage' | |
| 'Portola Valley Assemblage' | |
| 'Quaternary cover' | |
| 'Santa Cruz Assemblage' | |
| 'Sky Londa Assemblage' | |
| 'Woodside Assemblage' | |
| 'artificial fill' | |
| H20 | body of water |
| Value | Definition |
|---|---|
| contact, approx. located | Contact whose position is not precisely known |
| fault, certain | Observed fault |
| fault, concealed | Conclealed fault whose position is inferred |
| fault, concealed, queried | Concealed fault whose position is inferred and questionable |
| map boundary | boundary of mapped area |
| scratch boundary | boundary that connects two lines |
| water boundary | Boundary of a body of water |
| water boundary, certain | Boundary of a body of water |
| Value | Definition |
|---|---|
| 'La Honda' | |
| 'San Gregorio' | |
| 'Franklin Point' | |
| 'Mountain View' | |
| 'Palo Alto' | |
| Woodside | |
| 'Half Moon Bay' | |
| Cupertino | |
| 'Mindego Hill' | |
| 'Castle Rock Ridge' | |
| 'Big Basin' | |
| 'Pigeon Point' | |
| Felton | |
| Davenport | |
| 'Ano Nuevo' | |
| 'Santa Cruz' |
| Value | Definition |
|---|---|
| contact, certain | Known contact |
| leader | leader for text |
| map boundary | Mapped area |
| water boundary | Boundary of body of water |
| water boundary, certain | Boundary of body of water |
| Value | Definition |
|---|---|
| fault, approx. located | Fault whose position is not precisely known |
| fault, certain | Observed fault |
| fault, concealed | Concealed fault whose position is inferred |
| fault, concealed, queried | Concealed fault whose position is inferred and questionable |
| fault, inferred | Fault whose position is inferred |
| fault, inferred, queried | Fault whose position is inferred and questionable |
| reverse fault, approx. located | Reverse fault whose position is not precisely known |
| reverse fault, certain | Observed reverse fault |
| reverse fault, concealed | Concealed reverse fault whose position is inferred |
| thrust fault, approx. located | Thrust fault whose position is not precisely known. |
| thrust fault, certain | Observed thrust fault |
| thrust fault, concealed | Concealed thrust fault whose position is inferred |
| thrust fault, concealed, queried | Concealed thrust fault whose position is inferred and questionalble |
| Value | Definition |
|---|---|
| af | Artificial fill (Historic) |
| alf | Artificial levee fill (Historic) |
| Qhasc | Artificial stream channels (Historic) |
| Qhsc | Stream channel deposits (Holocene) |
| Qbs | Beach sand (Holocene) |
| Qhbm | Bay mud (Holocene) |
| Qhb | Basin deposits (Holocene) |
| Qhbs | Basin deposits, salt-affected (Holocene) |
| Qhfp | Floodplain deposits (Holocene) |
| Qhl | Natural levee deposits (Holocene) |
| Qhaf1 | Younger alluvial fan deposits (Holocene) |
| Qhaf | Alluvial fan and fluvial deposits (Holocene) |
| Qyf | Younger (inner) alluvial fan deposits (Holocene) |
| Qyfo | Younger (outer) alluvial fan deposits (Holocene) |
| Qcl | Colluvium (Holocene) |
| Qs | Sand dune and beach deposits (Holocene) |
| Qal | Alluvium (Holocene) |
| Qls | Landslide deposits (Pleistocene and/or Holocene) |
| Qpaf | Alluvial fan and fluvial deposits (Pleistocene) |
| Qpaf1 | Alluvial terrace deposits (Pleistocene) |
| Qpoaf | Older alluvial fan deposits (Pleistocene) |
| Qof | Coarse-grained older alluvial fan and stream terrace deposits (Pleistocene) |
| Qmt | Marine terrace deposits (Pleistocene) |
| QTsc | Santa Clara Formation (lower Pleistocene and upper Pliocene) |
| QTsl | Lake beds (upper Pliocene) |
| QTm | Merced Formation (lower Pleistocene and upper Pliocene) |
| Tp | Purisima Formation (Pliocene and upper Miocene) |
| Tptu | Tunitas Sandstone Member (Pliocene) |
| Tpl | Lobitos Mudstone Member (Pliocene) |
| Tpsg | San Gregorio Sandstone Member (Pliocene) |
| Tpp | Pomponio Mudstone Member (Pliocene) |
| Tpt | Tahana Member (Pliocene and upper Miocene) |
| Tsc | Santa Cruz Mudstone (upper Miocene) |
| Tsm | Santa Margarita Sandstone (upper Miocene) |
| Tms | Unnamed marine sandstone and shale (upper Miocene) |
| Tlad | Ladera Sandstone (upper(?) and middle Miocene) |
| Tm | Monterey Formation (middle Miocene) |
| Tlo | Lompico Sandstone (middle Miocene) |
| Tpm | Page Mill Basalt (middle Miocene) |
| Tuv | Unnamed Sedimentary and Volcanic Rocks (Miocene and Oligocene) |
| Tls | Lambert Shale and San Lorenzo Formation, Undivided (lower Miocene, Oligocene, and middle and upper Eocene) |
| Tla | Lambert Shale (Oligocene and lower Miocene) |
| Tmb | Mindego Basalt and related volcanic rocks (Miocene and/or Oligocene) |
| Tvq | Vaqueros Sandstone (lower Miocene and Oligocene) |
| Tz | Zayante Sandstone (Oligocene) |
| Tsl | San Lorenzo Formation (Oligocene and upper and middle Eocene) |
| Tsr | Rices Mudstone Member (Oligocene and upper Eocene) |
| Tst | Twobar Shale Member (middle and upper Eocene) |
| Tb | Butano Sandstone (middle and lower Eocene) |
| Tbu | Upper sandstone member, Butano Sandstone (middle and lower Eocene) |
| Tbm | Middle siltstone member, Butano Sandstone (middle and lower Eocene) |
| Tbl | Lower conglomerate and sandstone member, Butano Sandstone (middle and lower Eocene) |
| Tblc | Conglomerate, Butano Sandstone (middle and lower Eocene) |
| Tbs | Shale in Butano Sandstone (lower Eocene) |
| Tw | Whiskey Hill Formation (middle and lower Eocene) |
| Tws | Shale in Whiskey Hill Formation (lower Eocene) |
| Tu | Unnamed sedimentary rocks (Eocene?) |
| Tl | Locatelli Formation (Paleocene) |
| Tlss | Sandstone, Locatelli Formation (Paleocene) |
| Kpp | Pigeon Point Formation (Upper Cretaceous) |
| Ksh | Unnamed shale (Upper Cretaceous) |
| Ka | Conglomerate of strata of Anchor Bay (Wentworth, 1968) (Cretaceous) |
| Ks | Unnamed sandstone and shale (Cretaceous(?)) |
| Kgr | Granitic rocks of Montara Mountain (Cretaceous) |
| Kqd | Granitic rocks of Ben Lomond Mountain (Cretaceous) |
| KJv | Unnamed volcanic rocks (Cretaceous or older) |
| KJf | Franciscan Complex, undivided (Cretaceous and Jurassic) |
| fs | Sandstone, Franciscan Complex (Cretaceous and Jurassic) |
| fg | Greenstone, Franciscan Complex (Cretaceous and Jurassic) |
| fc | Chert, Franciscan Complex (Cretaceous and Jurassic) |
| fl | Limestone, Franciscan Complex (Cretaceous and Jurassic) |
| fm | Metamorphic rocks, Franciscan Complex (Cretaceous and Jurassic) |
| fh | Argillite, Franciscan Complex (Cretaceous and Jurassic) |
| fsr | Sheared rock (melange), Franciscan Complex (Cretaceous and Jurassic) |
| sp | Serpentinite (Cretaceous and/or Jurassic) |
| Jsv | Siliceous volcanic rocks and keratophyre (Jurassic?) |
| Jgb | Gabbro (Jurassic?) |
| db | Diabase and gabbro (Jurassic?) |
| gd | Gneissic granodiorite (Mesozoic or Paleozoic) |
| sch | Metasedimentary rocks (Mesozoic or Paleozoic) |
| m | Marble (Mesozoic or Paleozoic) |
| Value | Definition |
|---|---|
| contact, approx. located | Contact whose position is not precisely known |
| contact, certain | Observed contact |
| fault, approx. located | Fault whose position is not precisely known |
| fault, certain | Observed fault |
| fault, concealed | Concealed fault whose position is inferred |
| fault, concealed, queried | Concealed fault whose position is questionable |
| fault, inferred | Fault whose position is inferred |
| fault, inferred, queried | Fault whose position is inferred and questionable |
| map boundary | boundary of mapped area |
| reverse fault, approx. located | Reverse fault whose position is not precisely known |
| reverse fault, certain | Observed reverse fault |
| reverse fault, concealed | Concealed reverse fault whose position is inferred |
| scratch boundary, certain | Location of scratch boundary |
| thrust fault, approx. located | Thrust fault whose position is not precisely known |
| thrust fault, certain | Observed thrust fault |
| thrust fault, concealed | Concealed thrust fault whose position is inferred |
| thrust fault, concealed, queried | Concealed thrust fault whose position is inferred and questionable |
| water boundary | Boundary of body of water |
| water boundary, certain | Boudary of body of water |
| Value | Definition |
|---|---|
| f.a., anticline, approx. located | Anticlinal fold axis whose position is not precisely known |
| f.a., anticline, certain | Observed anticlinal fold axis |
| f.a., anticline, concealed | Concealed anticlinal fold axis whose position is inferred |
| f.a., syncline, approx. located | Synclinal fold axis whose position is not precisely known |
| f.a., syncline, certain | Observed synclinal fold axis |
| f.a., syncline, concealed | Concealed synclinal fold axis whose position is inferred |
| f.a., syncline, inferred, queried | Synclinal fold axis whose position is inferred and questionable |
| Value | Definition |
|---|---|
| approx bedding | Bedding orientation that is not precisely known |
| bedding | bedding orientation |
| bedding w/tops | Bedding orientation with tops |
| flat bedding | Basically horizontal bedding |
| foliation | Foliation orientation |
| ot bedding | Overturned bedding orientation |
| vert bedding | Vertical bedding orientation |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 90 |
| Units: | degrees |
| Resolution: | 1 |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 359 |
| Units: | degrees |
| Resolution: | 1 |
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 (deceased - Cretaceous and Eocene foraminifers), John Barron (Tertiary diatoms), Charles Powell II (Tertiary mollusks), and Bonita 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. We are grateful to Tracey Felger, who made the original scan and a preliminary edit of author materials; to Judy Mariant, who did additional editing and tagging of lines; and to Dominique Garnier, who digitized many of the bedding attitudes. Carl Wentworth kindly provided advice on digitizing and editing procedures. Ed Helley provided materials and advice on Quaternary units.
The purpose of this new map is to compile the best available data on the identity and distribution of bedrock units, surficial deposits, and geologic structures at a regional scale, and to integrate those data into a digital spatial database. The digital nature of the product is important because it allows the geologic data to be easily combined with other data to produce derivative products (some of which are discussed below), allows new information to be readily integrated into the map database, makes transfer of data to users easy via the Internet, and facilitates production of a high-quality paper maps.
Are there legal restrictions on access or use of the data?Access_Constraints: none
Use_Constraints: none
This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards or with the North American Stratigraphic Code. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
This database, identified as "Geology of the Palo Alto 30 X 60 minute quadrangle, California: A digital database," has been approved for release and publication by the Director of the USGS. Although this database 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: |
ARC/INFO export file Description of coverage pa_um-py.e00 Faults, depositional contacts, and rock units pa_um-sr.e00 Strike and dip information and fold axes pa_quad.e00 Index map of quadrangles pa_um-flt.e00 Index map of faults pa_corr.e00 Correlation table for the units pa_so.e00 Sources of data index map pa_as.e00 Index map of Assemblages pa_um-dr.e00 Drainage base map pa_um-cu.e00 Cultural base map pa_um-topo.e00 Topographic contours base mapin format ARCE (version 7.x) Size: 6.0 |
|---|---|
| Network links: |
http://pubs.usgs.gov/of/1998/of98-348/pa_g1.tar.gz |