Geomagnetic polarity epochs; Sierra Nevada data, [Part] 3
Doell, Richard R; Dalrymple, G Brent; Cox, Allan (1966) Geomagnetic polarity epochs; Sierra Nevada data, [Part] 3. Journal of Geophysical Research, vol.71, no.2, pp.531-541, 1966
| Authors | Doell, Richard R; Dalrymple, G Brent; Cox, Allan |
|---|---|
| Year | 1966 |
| Title | Geomagnetic polarity epochs; Sierra Nevada data, [Part] 3 |
| Source | Journal of Geophysical Research, vol.71, no.2, pp.531-541, 1966 |
| Publisher | American Geophysical Union, Washington, DC, United States USA |
| ISSN | 0148-0227 |
| GeoRef | 1966-000404 |
| Keywords | California; Cenozoic; Cenozoic polarity epochs; geochronology; paleomagnetism; polarity epochs; Sierra Nevada; United States |
Abstract
Available paleomagnetic and radiometric results for about 60 igneous rocks 3.6 m.y. old or less are consistent with the following geomagnetic polarity epoch time scale: Brunhes normal, 0.0 to 0.85+ or -0.15 m.y.; Matuyama reversed, 0.85+ or -15 to 2.4+ or -0.1 m.y.; Gauss normal, 2.4+ or -0.1 to 3.35+ or -0.1 m.y.; Gilbert reversed, 3.35+ or -0.1 m.y. to ?. A brief interval of normal polarity the Olduvai event occurs within the Matuyama epoch at about 1.9 m.y., and a brief interval of reversed polarity the Mammoth event occurs within the Gauss epoch at about 3.06 m.y. Data for 12 units from eastern California and Nevada, reported here for the first time, are particularly useful in defining the Gauss-Gilbert boundary and for recognizing the Mammoth event.