Potassium-argon age and paleomagnetism of the Bishop Tuff, California
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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.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Potassium-argon age and paleomagnetism of the Bishop Tuff, California |
| Series title | GSA Bulletin |
| DOI | 10.1130/0016-7606(1965)76[665:PAAPOT]2.0.CO;2 |
| Volume | 76 |
| Issue | 6 |
| Year Published | 1965 |
| Language | English |
| Publisher | Geological Society of America |
| Description | 10 p. |
| First page | 665 |
| Last page | 674 |
| Country | United States |
| State | California |
| Other Geospatial | Bishop Tuff |
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