| State | California |
|---|---|
| Name | Jurassic marine rocks, unit 2 (Coast Ranges) |
| Geologic age | Late Jurassic to Early Cretaceous |
| Lithologic constituents |
Major
Sedimentary > Clastic > Mixed-clastic > Siltstone-mudstone (Bed)Classified as shale in some references
Minor
Sedimentary > Clastic > Sandstone (Bed)Generally rich in volcanic rock fragments; low in quartz. In lenticular beds
Sedimentary > Clastic > Conglomerate (Bed, Lens)In lenticular beds
Incidental
Igneous > Volcanic (Pyroclastic-tuff)
|
| Comments | Coast Ranges. Lower Great Valley Sequence. Included in undivided Lower Cretaceous and Upper Jurassic rocks on most recent maps |
| Stratigraphic units | Knoxville Formation, Great Valley Sequence (part), Stony Creek Fm. (part), Elder Creek terrane (part) |
| References | Jennings, C.W., Strand, R.G., Rogers, T.H., Boylan, R.T., Moar, R.R., and Switzer, R.A., 1977, Geologic Map of California: California Division of Mines and Geology, Geologic Data Map 2, scale 1:750,000.Jennings, C.W., 1985, An explanatory text to accompany the 1:750,000 scale fault and geologic maps of California: California Division of Mines and Geology, Bulletin 201, 197 p.Strand, R.G., 1962, Geologic map of California, Olaf P. Jenkins edition, Redding sheet, scale 1:250,000.Jennings, C.W., and Burnett, J.L., 1961, Geologic map of California, Olaf P. Jenkins edition, San Francisco sheet, scale 1:250,000.Rogers, T.H., 1966, Geologic map of California, Olaf P. Jenkins edition, San Jose sheet, scale 1:250,000.Jennings, C.W., 1959, Geologic map of California, Olaf P. Jenkins edition, San Luis Obispo sheet, scale 1:250,000.Jennings, C.W., 1959, Geologic map of California, Olaf P. Jenkins edition, Santa Maria sheet, scale 1:250,000.Koenig, J.B., 1963, Geologic map of California, Olaf P. Jenkins edition, Santa Rosa sheet, scale 1:250,000.Jennings, C.W., and Strand, R.G., 1960, Geologic map of California, Olaf P. Jenkins edition, Ukiah sheet, scale 1:250,000.Wagner, D.L., Bortugno, E.J., and McJunkin, R.D., 1990, Geologic map of the San Francisco-San Jose quadrangle, California: California Division of Mines and Geology, Regional Geologic Map Series, Map 5A, scale 1:250,000.Wagner, D.L., and Bortugno, E.J., 1982, Geologic map of the Santa Rosa quadrangle, California: California Division of Mines and Geology, Regional Geologic Map Series, Map 2A, scale 1:250,000.Fraticelli, L.A., Albers, J.P., Irwin, W.P., and Blake, M.C., Jr., 1987, Geologic map of the Redding 1 X 2 degree quadrangle, Shasta, Tehama, Humboldt, and Trinity Counties, California: U.S. Geological Survey Open-File Report 87-257, scale 1:250,000.https://pubs.er.usgs.gov/publication/ofr87257 Graymer, R.W., Jones, D.L., and Brabb, E.E., 2002, Geologic map and map database of northeastern San Francisco Bay region, California: U.S. Geological Survey Miscellaneous Field Studies Map MF-2403, 28 p., scale 1:100,000.https://pubs.er.usgs.gov/publication/mf2403 Blake, M.C., Jr., Graymer, R.W., and Stamski, R.E., 2002, Geologic map and map database of western Sonoma, northernmost Marin, and southernmost Mendocino Counties, California: U.S. Geological Survey Miscellaneous Field Studies Map MF-2402, 43 p., scale 1:100,000.https://pubs.er.usgs.gov/publication/mf2402 Blake, M.C., Jr., Harwood, D.S., Helley, E.J., Irwin, W.P., Jayko, A.S., and Jones, D.L., 1999, Geologic map of the Red Bluff 30' x 60' quadrangle, California: U.S. Geological Survey Geologic Investigations Series Map I-2542, 15 p., scale 1:100,000.https://pubs.er.usgs.gov/publication/i2542 Ingersoll, R.V., Rich, E.I., and Dickinson, W.R., 1977, Field guide; Great Valley Sequence, Sacramento Valley; [Field trip no. 8]: Geological Society of America, Cordilleran Section, Guidebook for Field Trips, 73rd Annual Meeting, Sacramento, CA, April 5-7, 1977, 72 p. |
| NGMDB product | |
| Counties | Colusa - Contra Costa - Fresno - Glenn - Lake - Monterey - Napa - San Luis Obispo - Santa Barbara - Sonoma - Stanislaus - Tehama - Yolo |