ARC/INFO coverages sm_um-py.e00 Faults, depositional contacts, and rock units in San Mateo County sm_um-sr.e00 Strike and dip information and fold axes in San Mateo County sm_quad.e00 Index map of quadrangles in San Mateo County. sm_um-flt.e00 Index map of faults in San Mateo County with annotation showing the names of major faults. sm_corr.e00 Correlation table for the units in this map database. sm_so.e00 Sources of data index map for this map database. sm_as.e00 Index map of Assemblages in San Mateo County. (Assemblages are described in smgeo.txt or smgeo.ps) sm_um-dr.e00 Drainage base map (from 1:100,000 scale original). sm_um-cu.e00 Cultural base map (from 1:100,000 scale original). sm_um-topo.e00 Topographic contours base map (from 1:100,000 scale original).
Brabb, E.E., Graymer, R.W., and Jones, D.L., 1998, Geology of the onshore part of San Mateo County, California: A digital database: U.S. Geological Survey Open-File Report 98-137, U.S. Geological Survey, Menlo Park, CA.Online Links:
This is a Vector data set. It contains the following vector data types (SDTS terminology):
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 50
Ordinates (y-coordinates) are specified to the nearest 50
Planar coordinates are specified in meters
The horizontal datum used is NAD27.
The ellipsoid used is Clarke 1866.
The semi-major axis of the ellipsoid used is 6378206.
The flattening of the ellipsoid used is 1/294.98.
Value | Definition |
---|---|
contact, certain | Boundary between two mapped units that was observed. |
contact, concealed | Boundary between two mapped units that is concealed and its position inferred. |
contact, approx. located | Boundary between two mapped units whose position is not precisely known. |
fault, certain | Strike-slip fault that was observed. |
fault, concealed | Strike-slip fault that is concealed and its position inferred. |
fault, concealed, queried | Strike-slip fault that is concealed and ... queried? |
fault, approx. located | Strike-slip fault whose position is not precisely known. |
fault, inferred | Strike-slip fault whose position is inferred. |
reverse fault, certain | Reverse fault that was observed. |
reverse fault, concealed | Reverse fault that is concealed and its position inferred. |
scratch boundary | Boundary used for printing a diagram. |
water boundary | Boundary of a body of water. |
map boundary | Boundary of the mapped area. |
Value | Definition |
---|---|
0 | |
3 | |
4 | |
5 | |
6 |
Value | Definition |
---|---|
contact, certain | Boundary between two mapped units that was observed. |
scratch boundary | Boundary used for printing a diagram |
Value | Definition |
---|---|
contact, certain | Boundary between two mapped units that was observed. |
Value | Definition |
---|---|
leader | Line drawn to associate a number with one of the smaller mapped areas, when it would be impractical to place the identifying number inside the area. |
map boundary, | Boundary of the mapped area. |
Value | Definition |
---|---|
fault, certain | Strike-slip fault that was observed. |
fault, concealed | Strike-slip fault that is concealed and its position inferred. |
fault, concealed, queried | Strike-slip fault that is concealed and ... queried? |
fault, approx. located | Strike-slip fault whose position is not precisely known. |
fault, inferred | Strike-slip fault whose position is inferred. |
reverse fault, certain | Reverse fault that was observed. |
reverse fault, concealed | Reverse fault that is concealed and its position inferred. |
Value | Definition |
---|---|
0 | |
1 | |
3 | |
4 | |
5 |
Value | Definition |
---|---|
contact, certain | Boundary between two mapped units that was observed. |
contact, concealed | Boundary between two mapped units that is concealed and its position inferred. |
contact, approx. located | Boundary between two mapped units whose position is not precisely known. |
fault, certain | Strike-slip fault that was observed. |
fault, concealed | Strike-slip fault that is concealed and its position inferred. |
fault, concealed, queried | Strike-slip fault that is concealed and ... queried? |
fault, inferred | Strike-slip fault whose position was inferred. |
fault, inferred, queried | Strike-slip fault whose position was inferred and ... queried? |
fault, approx. located | Strike-slip fault whose position is not precisely known. |
fault, inferred | Strike-slip fault whose position is inferred. |
reverse fault, certain | Reverse fault that was observed. |
reverse fault, concealed | Reverse fault that is concealed and its position inferred. |
reverse fault, approx. located | Reverse fault whose position is not known with precision. |
scratch boundary | Boundary used for printing a diagram. |
water boundary | Boundary of a body of water. |
water boundary, | Boundary of a body of water. The comma at the end of the value is present in the database. |
map boundary | Boundary of the mapped area. |
map boundary, | Boundary of the mapped area. The comma at the end of the value is present in the database. |
Value | Definition |
---|---|
0 | |
1 | |
3 | |
4 | |
5 | |
6 |
Value | Definition |
---|---|
f.a., anticline, certain | Fold axis of an anticline that was observed. |
f.a., anticline, concealed | Fold axis of an anticline that is concealed and its position inferred. |
f.a., syncline, certain | Fold axis of a syncline that was observed. |
f.a., syncline, concealed | Fold axis of a syncline that is concealed and its position inferred. |
Value | Definition |
---|---|
(blank) | Map boundary polygon |
H2O | water body |
af | Artificial fill (Historic) |
alf | Artificial levee fill (Historic) |
Qhasc | Artificial stream channels (Historic) |
Qhsc | Stream channel deposits (Holocene) |
Qhbd | Beach deposits (Holocene) |
Qhbm | Bay mud (Holocene) |
Qhb | Basin deposits (Holocene) |
Qhfp | Floodplain deposits (Holocene) |
Qhl | Natural levee 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) |
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) |
Qc | Colma Formation (Pleistocene) |
QTsc | Santa Clara Formation (lower Pleistocene and 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) |
Tl | 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) |
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) |
Tbs | Shale in Butano Sandstone (lower Eocene) |
Tw | Whiskey Hill Formation (middle and lower Eocene) |
Tws | Shale in Whiskey Hill Formation (lower Eocene) |
Tss | Unnamed sandstone, shale, and conglomerate (Paleocene) |
Kpp | Pigeon Point Formation (Upper Cretaceous) |
Ksh | Unnamed shale (Upper Cretaceous) |
Ka | Anchor Bay Conglomerate (Cretaceous) |
Ks | Unnamed sandstone and shale (Cretaceous?) |
Kgr | Granitic rocks of Montara Mountain |
KJv | Unnamed volcanic rocks (Cretaceous or older) |
KJs | Unnamed sandstone (Cretaceous or Jurassic) |
KJf | Franciscan Complex, undivided (Cretaceous and Jurassic) |
fs | Sandstone |
fg | Greenstone |
fc | Chert |
fl | Limestone |
fm | Metamorphic rocks |
fcg | Conglomerate |
fsr | Sheared rock (melange) |
sp | Serpentinite (Cretaceous and/or Jurassic) |
Jsv | Siliceous volcanic rocks and keratophyre (Jurassic?) |
Jgb | Gabbro (Jurassic?) |
m | Marble and hornfels (Paleozoic?) |
Value | Definition |
---|---|
(blank) | Map boundary polygon |
H2O | water body |
af | Artificial fill (Historic) |
alf | Artificial levee fill (Historic) |
Qhasc | Artificial stream channels (Historic) |
Qhsc | Stream channel deposits (Holocene) |
Qhbd | Beach deposits (Holocene) |
Qhbm | Bay mud (Holocene) |
Qhb | Basin deposits (Holocene) |
Qhfp | Floodplain deposits (Holocene) |
Qhl | Natural levee 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) |
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) |
Qc | Colma Formation (Pleistocene) |
QTsc | Santa Clara Formation (lower Pleistocene and 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) |
Tl | 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) |
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) |
Tbs | Shale in Butano Sandstone (lower Eocene) |
Tw | Whiskey Hill Formation (middle and lower Eocene) |
Tws | Shale in Whiskey Hill Formation (lower Eocene) |
Tss | Unnamed sandstone, shale, and conglomerate (Paleocene) |
Kpp | Pigeon Point Formation (Upper Cretaceous) |
Ksh | Unnamed shale (Upper Cretaceous) |
Ka | Anchor Bay Conglomerate (Cretaceous) |
Ks | Unnamed sandstone and shale (Cretaceous?) |
Kgr | Granitic rocks of Montara Mountain |
KJv | Unnamed volcanic rocks (Cretaceous or older) |
KJs | Unnamed sandstone (Cretaceous or Jurassic) |
KJf | Franciscan Complex, undivided (Cretaceous and Jurassic) |
fs | Sandstone |
fg | Greenstone |
fc | Chert |
fl | Limestone |
fm | Metamorphic rocks |
fcg | Conglomerate |
fsr | Sheared rock (melange) |
sp | Serpentinite (Cretaceous and/or Jurassic) |
Jsv | Siliceous volcanic rocks and keratophyre (Jurassic?) |
Jgb | Gabbro (Jurassic?) |
m | Marble and hornfels (Paleozoic?) |
Value | Definition |
---|---|
bedding | A depositional surface |
flat bedding | A flat depositional surface |
foliation | A surface of metamorphic origin |
joint | Planar fractures |
ot bedding | Overturned bedding (older rocks on top) |
vert bedding | Vertical bedding surface |
vert foliation and bedding | Vertical foliation parallel to bedding |
vert joint | Vertical planar fractures |
Range of values | |
---|---|
Minimum: | 0 |
Maximum: | 90 |
Units: | degrees |
Resolution: | 1 |
Range of values | |
---|---|
Minimum: | 0 |
Maximum: | 359 |
Units: | degrees |
Resolution: | 1 |
SEL user defined field used to save a selected set SYMB user defined field used to save symbol assignments (such as color)The geologic linetypes are ALACARTE line types that correlate with the geologic line symbols in the ALACARTE line set GEOL61.LIN according to the ALACARTE lines lookup table (GEOL61.LUT).
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), Willam 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.
USGS Western Geologic Mapping Team
c/o Russ Graymer
345 Middlefield Road, MS 975
Menlo Park, CA 94025
USA
650-329-4921 (voice)
rgraymer@usgs.gov
This map is intended to be of general use to engineers and land-use planners. However, its small scale 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, 1988). Similarly, the database cannot be used to identify or delineate landslides in the region. For a depiction of landslide distribution, see Brabb and Pampeyan (1972), Brabb and others (1978), Mark (1992), Wieczorek and others (1985), and Wieczorek and others (1988).
U.S. Geological Survey, 1982, Topographic base map of Palo Alto, California.
U.S. Geological Survey, 1978, Topographic base map of San Francisco, California.
Brabb, E.E., Graymer, R.W., and Jones, D.L., 1998, sm_um-dr.e00: Drainage base map: U.S. Geological Survey Open-File Report 98-137, U.S. Geological Survey, Menlo Park, CA.Online Links:
Brabb, E.E., Graymer, R.W., and Jones, D.L., 1998, sm_um-cu.e00: Cultural base map: U.S. Geological Survey Open-File Report 98-137, U.S. Geological Survey, Menlo Park, CA.Online Links:
Brabb, E.E., Graymer, R.W., and Jones, D.L., 1998, sm_um-topo.e00: Topographic contours base map: U.S. Geological Survey Open-File Report 98-137, U.S. Geological Survey, Menlo Park, CA.Online Links:
Bonilla, M.G., 1965, Geologic map of the San Francisco South quadrangle, California: U.S. Geological Survey Open-File map 65-000.
Brabb, E.E., 1960, Geology of the Big Basin area, Santa Cruz Mountains, California: Stanford University, Stanford, California.
Brabb, E.E., 1964, Subdivision of San Lorenzo Formation (Eocene-Oligocene), west-central California: American Association of Petroleum Geologists Bulletin v. 48, no. 5.
Brabb, E.E., Clark, J.C., and Throckmorton, C.K., 1977, Measured sections of Paleogene rocks from the California Coast Ranges: U.S. Geological Survey Open-File Report 77-714.
Brown, R.D., Jr., 1972, Active faults, probable active faults, and associated fracture zones, San Mateo County, California: U.S. Geological Survey Miscellaneous Field Studies Map MF-355.
Clark, J.C., 1970, Geologic map of the Davenport area, Santa Cruz County, California: U.S. Geological Survey Open-File Report 70-000.
Clark, J.C., 1981, Stratigraphy, Paleontology, and Geology of the Central Santa Cruz Mountains, California Coast Ranges: U.S. Geological Survey Professional Paper 1168.
Clark, J.C., and Brabb, E.E., 1978, Stratigraphic contrasts across the San Gregorio fault, Santa Cruz Mountains, West-central California: California Division of Mines and Geology Special Report 137.
Classen, J.S., 1959, Geology of a portion of the Halfmoon Bay quadrangle, San Mateo County, California: Stanford University, Stanford, California.
Cummings, J.C., 1960, Geology of the Langley Hill-Waterman Gap area, Santa Cruz Mountains, California: Stanford University, Stanford, California.
Cummings, J.C., Touring, R.M., and Brabb, E.E., 1962, Geology of the northern Santa Cruz Mountains, California: California Division of Mines and Geology Bulletin 181.
Darrow, R.L., 1963, Age and structural relationships of the Franciscan Formation in the Montara Mountain quadrangle, California: California Division of Mines and Geology Special Report 78.
Dibblee, T.W., Jr., 1966, Geology of the Palo Alto quadrangle, Santa Clara and San Mateo Counties, California: California Division of Mines and Geology Map 8.
Esser, R.W., 1958, The reconnaissance geology of a part of the Woodside quadrangle northeast of Skyline Boulevard, San Mateo County, California: Stanford University, Stanford, California.
Glen, William, 1959, Pliocene and Lower Pleistocene of the western part of the San Francisco Peninsula: California University Publications, Geological Science v. 36, no. 2.
Hall, C.A., Jr., Jones, D.L., and Brooks, S.A., 1959, Pigeon Point Formation of Late Cretaceous age, San Mateo County, California: American Association of Petroleum Geologists Bulletin v. 43, no. 12.
Hall, N.T., 1965, Petrology of the type Merced Group, San Francisco Peninsula, California: California University, California.
Hall, N.T., 1965, Late Cenozoic stratigraphy between Mussel Rock and Fleishhacker Zoo, San Francisco Peninsula:.
Northern Great Basin and California-International Association of Quaternary Research, 1965, Guidebook for Field Conference 1, 7th Congress: Nebraska Academy of Science, Lincoln, Nebraska.
Helley, E.J., and Graymer, R.W., 1997, Quaternary geology of Alameda County, and parts of Contra Costa, Santa Clara, San Mateo, San Francisco, Stanislaus, and San Joaquin Counties, California: A digital database: U.S. Geological Survey Open-File Report 97-97.
Jack, R.N., 1969, Quaternary sediments at Montara, San Mateo County, California: California University, Berkeley, California.
Johnson, A.M., and Ellen, S.D., 1968, Preliminary evaluation of the interaction between engineering development and natural geologic processes on the Bovet property, Town of Portola Valley, California, with a section on the San Andreas fault by William R. Dickinson.
Lawson, A.C., 1914, Description of the San Francisco district: Tamalpais, San Francisco, Concord, San Mateo, and Hayward quadrangles: U.S. Geological Survey Geological Atlas, Folio 193.
Mack, J.E., 1959, Reconnaissance geology of part of the Woodside quadrangle, San Mateo County: Stanford University, Stanford, California.
McLaughlin, R.J., 1969, The Franciscan series and Eocene(?) rocks west of San Jose, San Carlos and Belmont, California: San Jose State College, San Jose, California.
Pampeyan, E.H., 1970, Geologic map of the Palo Alto 7.5-minute quadrangle, San Mateo and Santa Clara Counties, California: U.S. Geological Survey Open-File Report 70-000.
Pampeyan, E.H., 1970, Geologic map of the Redwood Point 7.5-minute quadrangle, San Mateo County, California: U.S. Geological Survey Open-File Report 70-000.
Pampeyan, E.H., 1993, Geologic map of the Palo Alto and part of the Redwood Point 7.5-minute quadrangles, San Mateo and Santa Clara Counties, California: U.S. Geological Survey Miscellaneous Investigations Map I-2371.
Pampeyan, E.H., 1994, Geologic map of the Montara Mountain and San Mateo 7.5-minute quadrangles, San Mateo County, California: U.S. Geological Survey Miscellaneous Investigations Map I-2390.
Schlocker, Julius, Pampeyan, E.H., and Bonilla, M.G., 1965, Approximate trace of the main surface rupture in the San Andreas fault zone between Pacifica and the vicinity of Saratoga, California, formed during the earthquake of April 18, 1906: U.S. Geological Survey Open-File Report 65-000.
Thomas, R.G., 1951, An example of reintrusion of serpentine: American Geophysical Union Transactions v. 32, no. 3.
Touring, R.M., 1959, Structure and stratigraphy of the La Honda and San Gregorio quadrangles, San Mateo County, California: University Microfilms, Ann Arbor, Michigan.
Weber, G.E., and Lajoie, K.R., 1980, Map of Quaternary faulting along the San Gregorio fault zone, San Mateo and Santa Cruz Counties, California: U.S. Geological Survey Open-File Report 80-907.
Data sources used in this process:
Data sources produced in this process:
The source map (see lines in coverage sm_so) subdivides the mapped region into 20 numbered sections. The authors of OFR 98-137 relied on a variety of published and unpublished sources of information to compile the map. The references and comments listed here indicate which sources of information were used by the authors to map each section.
1. Bonilla (1965). See also Hall (1965a and b).
2. Darrow (1963), modified from Pampeyan (1994), and field checking by authors.
3. Lawson (1914), extensively modified from Pampeyan (1994), and field checking by authors.
4. Jack (1969). See also Glen (1959) and Pampeyan (1994).
5. McLauglin (1969); some field checking by E.E. Brabb, 1969, and E.H. Pampeyan, 1971.
6. Pampeyan (1970b and 1993)
7. Unpublished geologic mapping by S.A. Brooks, K.F. Oles, and Eugene Borax, Union Oil Company of California, 1956, scale 1:24,000; some data from Classen (1959). Additional field work by T.W. Dibblee, Jr. 1947-49, and by E.E. Brabb, 1968-69.
8. New mapping by authors.
9. Thomas (1951) and field reconnaissance by E.E. Brabb, 1969, and E.H. Pampeyan, 1963.
10. Schlocker and other (1965), and Brown (1972).
11. Esser (1958), and Mack (1959), modified by field checking by E.E. Brabb, 1968-69.
12. Pampeyan (1970a and 1993). Some data from Dibblee ( 1966).
13. Helley and Graymer (1997).
14. Touring (1959). See also Cummings and others (1962). Bedrock geology modified from unpublished maps, scale 1:24,000, by F.J. Noble, S.A. Brooks, Eugene Borax, K.F. Oles, R. S. Fiske, H.L. Fothergill, R.N. Hacker, and J.H. van Amringe, Union Oil Company of California, 1951-57. Additional field work by T.W. Dibblee, Jr., 1947-49 and E.E. Brabb, 1958, 1968-69.
15. Dibblee (1966) and Johnson and Ellen (1968).
16. Dibblee (1966). Some data from Cummings (1960) and Cummings and others (1962).
17. Unpublished geologic mapping, scale 1:24,000 by S.A. Brooks and R.S. Fiske, Union Oil Company of California, 1956. Additional field work by T.W. Dibblee, Jr., 1947-49, J.C. Clark and E.E. Brabb, 1969-70, and T.R. Simoni, 1971. Some San Gregorio fault lines from Weber and Lajoie (1980) and Roberta Smith (written communication, 1993). See also Hall and others (1959).
18. Brabb (1960). See also Cummings and others (1962) and Brabb (1964).
19. Cummings (1960). See also Cummings and others (1962).
20. Clark (1970), Clark and Brabb (1978), and Brabb, Clark, and Throckmorton (1977). More recently Clark (1981).
Data sources used in this process:
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 at a scale of 1:24,000 means that higher resolution information is not present in the dataset. Plotting at scales larger than 1:24,000 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. Note that in contrast to the geologic coverages, the base map layers have a resolution of 1:100,000, so significant discrepancies with the geologic coverages are possible. The base map layers are provided for reference only.
The mapped area includes parts of the Pacific Ocean, San Francisco Bay, and several large lakes; these areas are identified as water bodies and the geologic units underlying them are not indicated in this report.
The map is compiled from 20 different sources, including direct observations by the authors. One of the included coverages (SM_SO.E00) indicates the geographic area covered by each of the source maps. Citations for published sources are given in the lineage, and unpublished sources and original mapping are described in the appropriate process step.
Are there legal restrictions on access or use of the data?
- Access_Constraints: None
- Use_Constraints: None
San Mateo County Geologic Database
Database coordinator
345 Middlefield Road, MS 975
Menlo Park, CA 94025
USA
650-329-4921 (voice)
rgraymer@usgs.gov
USGS Open-File Report 98-137
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 San Mateo County, 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 coverages sm_um-py.e00 Faults, depositional contacts, and rock units in San Mateo County sm_um-sr.e00 Strike and dip information and fold axes in San Mateo County sm_quad.e00 Index map of quadrangles in San Mateo County. sm_um-flt.e00 Index map of faults in San Mateo County with annotation showing the names of major faults. sm_corr.e00 Correlation table for the units in this map database. sm_so.e00 Sources of data index map for this map database. sm_as.e00 Index map of Assemblages in San Mateo County. (Assemblages are described in smgeo.txt or smgeo.ps) sm_um-dr.e00 Drainage base map (from 1:100,000 scale original). sm_um-cu.e00 Cultural base map (from 1:100,000 scale original). sm_um-topo.e00 Topographic contours base map (from 1:100,000 scale original).in format gzipped tar containing ARC/INFO export files and text files. (version ARC/INFO version 7.0.4 produced the export files.) Size: 5.4 megabytes |
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Network links: |
<http://wrgis.wr.usgs.gov/open-file/of98-137/sm_g1.tar.gz> <ftp://wrgis.wr.usgs.gov/pub/open-file/of98-137/sm_g1.tar.gz> |
The map can be downloaded as a 5.5 megabyte PDF file from <http://wrgis.wr.usgs.gov/open-file/of98-137/smmap.pdf>
The explanation sheet can be downloaded as a 1.2 megabyte PDF file from <http://wrgis.wr.usgs.gov/open-file/of98-137/smexpl.pdf>
Database files, PostScript plotfiles, and related files can be obtained by sending a tape or CDR (Recordable CD-ROM) with request and return address to:
San Mateo County Geologic Database c/o Database Coordinator U.S. Geological Survey 345 Middlefield Road, M/S 975 Menlo Park, CA 94025Do not omit any part of this address!NOTE: Be sure to include with your request the exact names, as listed above, of the tar files you require. An Open-File Report number is not sufficient, unless you are requesting both the database package and plotfile package for the report.
The compressed tar file will be returned on the tape or CD-ROM. The acceptable tape type is: 2.3 or 5.0 GB, 8 mm Exabyte tape.
ARC/INFO version 7.0.4 or later
U.S. Geological Survey Information Services
Box 25286 Denver Federal Center
Denver, CO 80225
USA
303-202-4700 (voice)
303-202-4693 (FAX)
USGS Open-File Report 98-137
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 San Mateo County, 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.
Peter N. Schweitzer
U.S. Geological Survey
12201 Sunrise Valley Drive, Mail Stop 918
Reston, VA 20192
USA
703-648-6533 (voice)
703-648-6560 (FAX)
pschweitzer@usgs.gov