|Qhsc||Stream channel deposits (Holocene)|
|Qhl||Natural levee deposits (Holocene)|
|Qhfp2||Second alluvial terrace deposits (Holocene)|
|Qhfp1||First alluvial terrace deposits (Holocene)|
|Qhfp||Floodplain deposits (Holocene)|
|hb||Floodbasin deposits (Holocene)|
|Qhbs||Salt-affected floodbasin deposits (Holocene)|
|Qhbm||Estuary deposits (bay mud) (Holocene)|
|Qhaf1||Younger alluvial fan deposits (Holocene)|
|Qhaf||Alluvial fan deposits (Holocene)|
|Qls||Landslide deposits (Pleistocene and Holocene)|
|Qpaf1||Younger alluvial fan deposits (Pleistocene)|
|Qpaf||Alluvial fan deposits (Pleistocene)|
|Qpoaf||Older alluvial fan deposits (Pleistocene)|
|QTsc||Santa Clara Formation (Pliocene and Pleistocene)|
|br||Undifferentiated bedrock (Pliocene and older)|
|contact, certain||Observed contact|
|contact, approx. located||Contact whose position is not precisely known|
|contact, concealed||Contact whose position is concealed and inferred|
|fault, certain||Observed fault|
|fault, approx. located||Fault whose position is not precisely known|
|fault, concealed||Concealed fault whose position is inferred|
|water boundary, certain||Boundary of a body of water|
|map boundary||Boundary of mapped area|
|ca. 1850 shoreline||Historical 1850 shoreline|
Quadrangle abbrev. Quadrangle full name cal Calaveras Reservoir quadrangle cup Cupertino quadrangle mil Milpitas quadrangle mtv Mountain View quadrangle pal Palo Alto quadrangle sje San Jose East quadrangle sjw San Jose West quadrangle sth Santa Teresa Hills quadrangle
Compilation of the digital database depended on advice and assistance in the use of ALACARTE - ARC/INFO from T.T. Fitzgibbon and C.M. Wentworth. E.E. Brabb provided helpful information.
Together with the accompanying text file (scgeo.txt), this digital map database provides current information on the Quaternary geology of the area covered. The database delineates map units that are identified by general age and lithology following the compilation sources. One bedrock unit, the Santa Clara formation, is differentiated but the other bedrock units are combined and are not identified. More specific information about the units may be available in the original Open-file reports.
Are there legal restrictions on access or use of the data?
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 "Preliminary Quaternary geologic maps of Santa Clara Valley, Santa Clara, Alameda, and San Mateo Counties, 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.
ARC/INFO coverage Description of coverage cal_utm Quaternary geology of Calaveras Reservoir quadrangle cup_utm Cupertino quadrangle mil_utm Milpitas quadrangle (Helley and Wesling, 1989) mtv_utm Mountain View quadrangle pal_utm Palo Alto quadrangle sje_utm San Jose East quadrangle (Helley and Wesling, 1990) sjw_utm San Jose West quadrangle (Wesling and Helley, 1989) sth_utm Santa Teresa Hills quadrangle explsc_utm explsc_ano Together, these ARC coverages produce a plottable or displayable map explanation and key corr_utm corr_ano Together, these ARC coverages contain a correlation table for the units in these maps scc_dr Drainage base map scc_cu Cultural base map scc_topo Topographic contours base mapin format ARCE (version 6.x) Size: 8.3