Research Article| May 01, 1984 Offset along the San Andreas fault of Eocene strata from the San Juan Bautista area and western San Emigdio Mountains, California TOR H. NILSEN TOR H. NILSEN 1U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar Author and Article Information TOR H. NILSEN 1U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1984) 95 (5): 599–609. https://doi.org/10.1130/0016-7606(1984)95<599:OATSAF>2.0.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation TOR H. NILSEN; Offset along the San Andreas fault of Eocene strata from the San Juan Bautista area and western San Emigdio Mountains, California. GSA Bulletin 1984;; 95 (5): 599–609. doi: https://doi.org/10.1130/0016-7606(1984)95<599:OATSAF>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract Analyses of Eocene strata that rest on gabbroic basement rocks in the western San Emigdio Mountains and northernmost Gabilan Range indicate that the 2 sequences have been offset right-laterally 305–320 km along the San Andreas fault. In both areas, basal shallow-marine conglomerate of Penutian age grades upward into shale of Ulatisian and Narizian age that was deposited at bathyal water depths in a basin with access to open ocean. Additional similarities in the upper Eocene and Oligocene stratigraphic units suggest original contiguity of the depositional basins. The inferred offset indicates that the Salinian block was attached to western California by at least early Eocene time. The longer distances of northward transport of the Salinian block that are suggested by preliminary paleomagnetic data from upper Mesozoic granitic rocks and Upper Cretaceous and Paleocene strata must have occurred during Paleocene or earlier time. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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Tor H. Nilsen (1984) studied this question.