Potassium-argon dates of three pleistocene interglacial basalt flows from the Sierra Nevada, california
GSA Bulletin
By: G. Brent Dalrymple
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Abstract
Potassium-argon dates of 90,000 ± 90,000 years and 60,000 ± 50,000 years on the basalt in Sawmill Canyon of the Sierra Nevada, California, that underlies a moraine correlated with the Tahoe Glaciation and overlies pre-Tahoe till show that the Tahoe is probably less than 100,000 years old. Pre-Tahoe basalt near Sonora Pass gives a date of 150,000 ± 30,000 years. These data support the correlation of the Tahoe with early Wisconsin. Tahoe Glaciation in the southernmost Sierra Nevada seems to have been no less extensive than pre-Tahoe glaciation. The basalt that forms the Devils Postpile, believed by Matthes (1960) to have been extruded between his El Portal (Sherwin?) and Wisconsin glaciations, gives a date of 940,000 ± 160,000 years.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Potassium-argon dates of three pleistocene interglacial basalt flows from the Sierra Nevada, california |
| Series title | GSA Bulletin |
| DOI | 10.1130/0016-7606(1964)75[753:PDOTPI]2.0.CO;2 |
| Volume | 75 |
| Issue | 8 |
| Year Published | 1964 |
| Language | English |
| Publisher | Geological Society of American |
| Description | 6 p. |
| First page | 753 |
| Last page | 758 |
| Country | United States |
| State | California |
| Other Geospatial | Sierra Nevada |
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