Geomagnetic polarity event recorded at 1.1 m.y. B.P. on Cobb Mountain, Clear Lake volcanic field, California
Geology
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Abstract
Paleomagnetic studies show that a normal polarity event within the Matuyama reversed polarity epoch is recorded by one of the volcanic units on Cobb Mountain in northern California. K-Ar age determinations show that this event has an age of 1.12 ± 0.02 m.y. and clearly preceded the Jaramillo normal polarity event. These data provide the first confirmation from a subaerial volcano that a brief polarity event occurred at this time, as suggested by published studies of some marine sedimentary cores and magnetic anomalies. This new event is herein named the “Cobb Mountain normal polarity event.”
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Geomagnetic polarity event recorded at 1.1 m.y. B.P. on Cobb Mountain, Clear Lake volcanic field, California |
| Series title | Geology |
| DOI | 10.1130/0091-7613(1978)6<653:GPERAM>2.0.CO;2 |
| Volume | 6 |
| Issue | 11 |
| Year Published | 1978 |
| Language | English |
| Publisher | Geological Society of America |
| Contributing office(s) | Geology, Minerals, Energy, and Geophysics Science Center |
| Description | 4 p. |
| First page | 653 |
| Last page | 656 |
| Country | United States |
| State | California |
| Other Geospatial | Cleak Lake volcanic field |
| Google Analytic Metrics | Metrics page |