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Geologic and Geophysical Maps of the Santa Maria and Part of the Point Conception 30'×60' Quadrangles, California

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Geologic and Geophysical Maps of the Santa Maria and Part of the Point Conception 30'×60' Quadrangles, California Geologic and Geophysical Maps of the Santa Maria and Part of the Point Conception 30'×60' Quadrangles, California Pamphlet to accompany Scientific Investigations Map 3472 Supersedes USGS Open-File Reports 95–25 and 92–189 U.S. Department of the Interior U.S. Geological Survey Cover. Looking northwest from near Zaca Creek to Zaca Ridge on the east edge of the map area (see pamphlet figure 2 for location of Zaca Creek and Zaca Ridge). Hills in foreground are underlain by gently dipping early Pleistocene and upper Pliocene Paso Robles Formation locally overlain by late Pleistocene fluvial terrace deposits. Zaca Ridge, the high peak on the skyline at left edge of photo, is underlain by folded Miocene Monterey Formation. Photograph taken by Donald S. Sweetkind, U.S. Geological Survey, September 2010. Geologic and Geophysical Maps of the Santa Maria and Part of the Point Conception 30’×60’ Quadrangles, California By Donald S. Sweetkind, Victoria E. Langenheim, Kristin McDougall-Reid, Christopher C. Sorlien, Shiera C. Demas, Marilyn E. Tennyson, and Samuel Y. Johnson Pamphlet to accompany Scientific Investigations Map 3472 Supersedes USGS Open-File Reports 95–25 and 92–189 U.S. Department of the Interior U.S. Geological Survey U.S. Geological Survey, Reston, Virginia: 2021 Supersedes USGS Open-File Reports 95–25 and 92–189 For more information on the USGS—the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment—visit https://www.usgs.gov or call 1–888–ASK–USGS. For an overview of USGS information products, including maps, imagery, and publications, visit https://store.usgs.gov/. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner. Suggested citation: Sweetkind, D.S., Langenheim, V.E., McDougall-Reid, K., Sorlien, C.C., Demas, S.C., Tennyson, M.E., and Johnson, S.Y., 2021, Geologic and geophysical maps of the Santa Maria and part of the Point Conception 30'×60' quadrangles, California: U.S. Geological Survey Scientific Investigations Map 3472, 1 sheet, scale 1:100,000, 58-p. pamphlet, https://doi.org/ 10.3133/ sim3472. [Supersedes USGS Open-File Reports 95–25 and 92–189.] Associated data for this publication: Sweetkind, D.S., Langenheim, V.E., and McDougall-Reid, K., 2021, Data release—Geologic and geophysical maps of the onshore parts of the Santa Maria and Point Conception 30'x60' quadrangles, California: U.S. Geological Survey data release, https://doi.org/10.5066/P9FU7SJL. ISSN 2329-132X (online) iii Contents Introduction.....................................................................................................................................................1 Previous Mapping ..........................................................................................................................................5 Present Compilation ��������������������������������������������������������������������������������������������������������������������������������������5 Interactive Portable Document Format (PDF) Map .........................................................................8 Paleontology ...................................................................................................................................................8 Stratigraphy ..................................................................................................................................................10 Nacimiento Domain ............................................................................................................................10 Sierra Madre Domain .........................................................................................................................10 Huasna Domain �����������������������������������������������������������������������������������������������������������������������������������10 Santa Maria Domain...........................................................................................................................11 Santa Ynez and Santa Rosa Hills Domains .....................................................................................12 Santa Ynez Domain ....................................................................................................................12 Santa Rosa Hills Domain ..........................................................................................................13 Structures......................................................................................................................................................13 Onshore faults �������������������������������������������������������������������������������������������������������������������������������������13 Nacimiento Fault ........................................................................................................................13 East Huasna (Cachuma) Fault ..................................................................................................14 Little Pine Fault ...........................................................................................................................14 Foxen Canyon Fault ...................................................................................................................14 Santa Maria Mesa Fault ...........................................................................................................15 West Huasna Fault .....................................................................................................................15 Northeast-Striking Faults of the Santa Maria Domain ........................................................15 Casmalia Fault ............................................................................................................................15 Baseline-Lompoc Fault .............................................................................................................16 Lions Head Fault .........................................................................................................................16 Santa Ynez River Fault ..............................................................................................................16 Honda Fault ���������������������������������������������������������������������������������������������������������������������������������17 Santa Ynez Fault .........................................................................................................................17 Offshore Structures ............................................................................................................................17 Hosgri Fault ���������������������������������������������������������������������������������������������������������������������������������17 Purisima Structure .....................................................................................................................18 Lompoc Structure ......................................................................................................................18 Amberjack High ..........................................................................................................................18 North Channel Fault ...................................................................................................................18 Potential-Field Anomalies...........................................................................................................................19 Gravity Anomalies �������������������������������������������������������������������������������������������������������������������������������19 Magnetic Anomalies ..........................................................................................................................21 Relationship of Geophysical Anomalies to Neogene Structure �������������������������������������������������22 Acknowledgments .......................................................................................................................................25 Description of Map Units ����������������������������������������������������������������������������������������������������������������������������26 Quaternary surficial deposits ...........................................................................................................26 Cenozoic sedimentary rocks .............................................................................................................28 Cenozoic volcanic rocks ....................................................................................................................36 iv Mesozoic sedimentary rocks ............................................................................................................37 Mesozoic melange, serpentinite, and ophiolitic rocks .................................................................38 References Cited..........................................................................................................................................39 Appendix 1. Tables of Locations for Paleontological Samples .........................................................56 Appendix 2. Foraminifer Fossil Checklist Tables .................................................................................57 Figures
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