Online Links:
| Value | Definition |
|---|---|
| Qtl | Colluvium (Holocene) |
| Qal | Alluvial deposits, undifferentiated (Holocene) |
| Qb | Basin deposits (Holocene) |
| Qbs | Beach sand (Holocene) |
| Qt | Terrace deposits, undifferentiated (Pleistocene) |
| Qes | Eolian deposits of Sunset Beach (Pleistocene) |
| Qcl | Lowest emergent coastal terrace deposits (Pleistocene) |
| Qcu | Coastal terrace deposits, undifferentiated (Pleistocene) |
| Qyf | Younder flood-plain deposits (Holocene) |
| Qof | Older flood-plain deposits (Holocene) |
| Qyfo | Alluvial fan deposits (Holocene) |
| Qds | Dune sand (Holocene) |
| Qcf | Abandoned channel fill deposits (Holocene) |
| Qem | Eolian deposits of Manresa Beach (Pleistocene) |
| Qwf | Fluvial facies (Pleistocene) |
| Qof | Alluvial fan facies (Pleistocene) |
| Qce | Eolian facies - Coastal terrace deposits (Pleistocene) |
| Qcl | Lowest emergent coastal terrace deposits - Coastal terrace deposits (Pleistocene) |
| Qar | Aromas Sand, undivided (Pleistocene) |
| Qae | Eolian lithofacies - Aromas sand (Pleistocene) |
| Qaf | Fluvial lithofacies - Aromas Sand (Pleistocene) |
| QTc | Continental deposits, undifferentiated (Pleistocene and Pliocene?) |
| Tp | Purisima Formation (Pliocene and upper Miocene) |
| Tps | Predominantly massive sandstone |
| Tsc | Santa Cruz Mudstone (Upper Miocene) |
| Tsm | Santa Margarita Sandstone (upper Miocene) |
| Tm | Monterey Formation (middle Miocene) |
| Tlo | Lompico Sandstone (middle Miocene) |
| Tla | Lambert Shale (lower Miocene) |
| Tvq | Vaqueros Sandstone (lower Miocene and Oligocene) |
| Tbs | Basalt (lower Miocene) |
| Tz | Zayanite Sandstone (Oligocene) |
| Tsl | San Lorenzo Formation, undivided (Oligocene and Eocene) |
| Tsr | Rices Mudstone Member (Oligocene and Eocene) |
| Tst | Twobar Shale Member (Eocene) |
| Tbu | Upper sandstone member - Butano Sandstone (Eocene) |
| Tbm | Middle siltstone member - Butano Sandstone (Eocene) |
| Tbl | Lower sandstone member - Butano Sandstone (Eocene) |
| Tblc | Conglomerate - Butano Sandstone (Eocene) |
| Tl | Locatelli Formation (Paleocene) |
| Tlss | Sandstone - Locatelli Formation (Paleocene) |
| Ts | Siltstone and sandstone (Pliocene and upper Miocene) |
| Tmp | Shale of Mount Pajaro area (Miocene and Oligoene) |
| Tmm | Sandstone of Mount Madonna area (Eocene?) |
| Tms | Mudstone of Maymens Flat area (Eocene and Paleocene) |
| Kgs | Shale and sandstone of Nibbs Knob area (Upper Cretaceous) |
| Kcg | Conglomerate (Upper Cretaceous) |
| qd | Quartz diorite (Cretaceous) |
| ga | Granite and adamellite (Cretaceous) |
| gd | Gneissic granodiorite (Cretaceous) |
| hcg | Hornblende-cummingtonite gabbro (Cretaceous) |
| sch | Metasedimentary rocks (Mesozoic or Paleozoic) |
| m | Marble (Mesozoic or Paleozoic) |
| db | Diabase (age unknown) |
| Value | Definition |
|---|---|
| contact, approx. located | Contact whose position is not precisely known |
| contact, certain | Observed contact |
| contact, inferred | Contact whose position is inferred |
| fault, approx. located | Fault whose position is not precisely known |
| fault, certain | Observed fault |
| fault, concealed | Concealed fault whose position is inferred |
| map boundary, certain | Boundary of mapped area |
| scratch boundary | Location of scratch boundary |
| scratch boundary, countyline | Location of countyline |
| water boundary | Boundary of a 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 |
| Value | Definition |
|---|---|
| approx dip of bedding | Approximate orientation of bedding plane |
| bedding | Bedding plane orientation |
| flat bedding | Bedding whose dip is practially horizontal |
| foliation | Foliation orientation |
| ot bedding | Overturned bedding plane orientation |
| vert bedding | Vertical bedding plane orientation |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 90 |
| Units: | degrees |
| Resolution: | 1 |
| Range of values | |
|---|---|
| Minimum: | 0 |
| Maximum: | 359 |
| Units: | degrees |
| Resolution: | 1 |
I am most grateful to Joseph Clark, Indiana University, Pennsylvania, whose work forms the core of the County geology, and whose continual interest provides a rich resource to address unsolved problems. I am also grateful to William Dupre, University of Houston, for his help with the Quaternary geology, and to Thomas Dibblee, Jr., retired, and Robert McLaughlin for their work on the bedrock geology. Robert Smith kindly provided new information on a strand of the San Gregorio fault. David Burky, Kristin McDougall, William Sliter (deceased) and John Barron provided many identifications and ages for microfossils in an area characterized by poor outcrops, several formations with similar lithology, and complex structure.
To provide a digital database of the Santa Cruz county, California to the public
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. 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 "Geologic map of Santa Cruz County, California: A Digital Database," has been approved for release and publication by the Director of the USGS. Although this database has been reviewed and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. This database is released on condition that neither the USGS nor the U. S. Government may be held liable for any damages resulting from its use.
| Data format: | Depositional contacts and unit labels, Fold axes, strike and dip information, Topographic base map in format ARCE (version 7.x) Size: 9.8 |
|---|---|
| Network links: |
http://pubs.usgs.gov/of/1997/of97-489/scruz.tar.gz |