| State | California |
|---|---|
| Name | Mesozoic volcanic rocks, unit 4 (Peninsular Ranges) |
| Geologic age | Late Jurassic to Early Cretaceous |
| Lithologic constituents |
Major
Igneous > Volcanic > Felsic-volcanic (Flow, Pyroclastic-tuff, Volcaniclastic-volcanic breccia)Flows, tuff, agglomerate, and breccia. Weakly metamorphosed
Igneous > Volcanic > Mafic-volcanicAndesitic to basaltic volcanic rocks
Minor
Sedimentary > Clastic (Bed)Volcaniclastic sandstone, siltstone, mudstone, and Sedimentary_breccia
Incidental
Metamorphic > Amphibolite
|
| Comments | Peninsular Ranges. Predominantly weakly metamorphosed andesitic to rhyolitic flows, tuff, agglomerate, and breccia, with minor sedimentary rocks and basalt |
| Stratigraphic units | Black Mountain Volcanics, Santiago Peak Volcanics, Temescal Wash Quartz Latite Porphyry |
| 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, San Diego-El Centro sheet, scale 1:250,000.Rogers, T.H., 1966, Geologic map of California, Olaf P. Jenkins edition, Santa Ana sheet, scale 1:250,000.Morton, D.M., 1999, Preliminary digital geologic map of the Santa Ana 30' x 60' quadrangle, southern California: U.S. Geological Survey Open-File Report 99-172, scale 1:100,000.https://pubs.er.usgs.gov/publication/ofr99172 Weber, F.H., Jr., 1963, Geology and mineral resources of San Diego County, California: California Division of Mines and Geology, County Report 3, 309 p., scale 1:125,000.Gastil, Gordon, Morgan, George, and Krummenacher, Daniel, 1981, The tectonic history of peninsular California and adjacent Mexico, in Ernst, W.G., ed., The geotectonic development of California (Rubey Volume 1): Englewood Cliffs, N.J., Prentice-Hall, p. 284-306.Todd, V.R., Erskine, B.G., and Morton, D.M., 1988, Metamorphic and tectonic evolution of the northern Peninsular Ranges Batholith, southern California, in Ernst, W.G., ed., Metamorphism and crustal evolution of the western United States (Rubey Volume 7): Englewood Cliffs, N.J., Prentice-Hall, p. 894-937. |
| NGMDB product | |
| Counties | Orange - Riverside - San Diego |