Marilyn E. Tennyson Tracey J. Mercier Phuong A. Le Andrea D. Cicero Ronald M. Drake II Sarah E. Gelman Jane S. Hearon Benjamin G. Johnson Jenny H. Lagesse Heidi M. Leathers-Miller Christopher J. Schenk 2025 <p class="MsoNormal">Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean conventional resources of 67 million barrels of oil and 56 billion cubic feet of gas in the Santa Maria Basin Province of California.&nbsp;&nbsp;</p> application/pdf 10.3133/fs20253052 en U.S. Geological Survey Assessment of undiscovered oil and gas resources in the Santa Maria Basin Province, California, 2024 reports