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

Scientific Investigations Map 3472
By: , and 



This report presents digital geologic, gravity, and aeromagnetic maps for the onshore parts of the Santa Maria and Point Conception 30'x60' quadrangles at a compilation scale of 1:100,000. The map depicts the distribution of bedrock units, surficial deposits, paleontological data, geophysical data and structural features in the Santa Maria basin and the Santa Ynez Mountains to the south, an area corresponding to 26 contiguous 7.5-minute quadrangles. The map also includes offshore faults from the Hosgri fault, a major structural feature, east to the shoreline. This new map revises and supersedes two earlier versions of the 30'x60' Santa Maria quadrangle that were produced as part of the U.S. Geological Survey’s investigations of onshore oil and gas resources of the Santa Maria province (Keller, 1995). The first map was released as a scanned black-and-white image of hand-drawn compilation (Tennyson, 1992); the second map was a digital release that is no longer available (Tennyson and others, 1995). This new map also includes the geology of the onshore part of the adjacent Point Conception 30'x60' quadrangle that encompasses the Santa Ynez Mountains of the western Transverse Ranges. The digital database also contains magnetic and gravity data for the entire region, paleontological data, and interpretation of major offshore structural features that bear on the continuity and connection of the mapped onshore structures.

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, [Supersedes USGS Open-File Reports 95–25 and 92–189.]

ISSN: 2329-132X (online)

Study Area

Table of Contents

  • Introduction
  • Previous Mapping
  • Present Compilation
  • Paleontology
  • Stratigraphy
  • Structures
  • Potential-Field Anomalies
  • Acknowledgments
  • Acknowledgments
  • Description of Map Units
  • References Cited
  • Appendix 1. Tables of Locations for Paleontological Samples
  • Appendix 2. Foraminifer Fossil Checklist Tables
Publication type Report
Publication Subtype USGS Numbered Series
Title Geologic and geophysical maps of the Santa Maria and part of the Point Conception 30'×60' quadrangles, California
Series title Scientific Investigations Map
Series number 3472
DOI 10.3133/sim3472
Year Published 2021
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Contributing office(s) Central Energy Resources Science Center, Geology, Minerals, Energy, and Geophysics Science Center, Geosciences and Environmental Change Science Center, Pacific Coastal and Marine Science Center
Description Report: vi, 58 p.; 9 Sheets: 57.14 x 35.04 inches or smaller; Data Release; ReadMe; Related Works
Country United States
State California
Online Only (Y/N) Y
Google Analytic Metrics Metrics page
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