1965/01/01 by G. Brent Dalrymple, Allan Cox, Richard R. Doell · 95 citations
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paper · doi:10.1130/0016-7606(1965)76[665:paapot]2.0.co;2
published in Geological Society of America Bulletin 76(6), 665 (Geological Society of America)
openalex publication_date 1965/01/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/26
Research Article| June 01, 1965 Potassium-Argon Age and Paleomagnetism of the Bishop Tuff, California G BRENT DALRYMPLE; G BRENT DALRYMPLE U. S. Geological Survey, Menlo Park, Calif. Search for other works by this author on: GSW Google Scholar ALLAN COX; ALLAN COX U. S. Geological Survey, Menlo Park, Calif. Search for other works by this author on: GSW Google Scholar RICHARD R DOELL RICHARD R DOELL U. S. Geological Survey, Menlo Park, Calif. Search for other works by this author on: GSW Google Scholar GSA Bulletin (1965) 76 (6): 665–674. 10.1130/0016-7606(1965)76[665:PAAPOT]2.0.CO;2 Article history received: 18 Jan 1965 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation G BRENT DALRYMPLE, ALLAN COX, RICHARD R DOELL; Potassium-Argon Age and Paleomagnetism of the Bishop Tuff, California. GSA Bulletin 1965;; 76 (6): 665–674. doi: 10.1130/0016-7606(1965)76[665:PAAPOT]2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search nav search search input Search input auto suggest search filter All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract Duplicate potassium-argon age determinations on each of three samples from widely separated localities indicate that the age of the Bishop Tuff, California, is about 0.7 million years. Two of the samples are from the basal ash fall that preceded the ash flow eruptions; one of these two samples was collected within 1 m of the contact of the Bishop Tuff with the underlying Sherwin Till. The third sample is from near the present exposed surface of the Bishop Tuff. The minimum age of the Sherwin Till (Kansan?) is thus 0.7 million years. The samples used for previously published age determinations of about 1 million years were probably contaminated with older material. Paleomagnetic results from five widely separated localities indicate that the welded part of the Bishop Tuff became magnetized when the geomagnetic field was normal and that it may have cooled in several centuries or less. The Brunhes-Matuyama polarity epoch boundary is now uncertain in the range of 0.7 to 1.0 million years. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not currently have access to this article.