Recent paleomagnetic-radiometric data from six rhyolite domes in the Valles Caldera, New Mexico, indicate that the last change in polarity of the earth's magnetic field from reversed to normal (the Brunhes-Matuyama boundary) occurred at about 0.7 million years ago. A previously undiscovered geomagnetic polarity event, herein named the "Jaramillo normal event," occurred about 0.9 million years ago.
Citation Information
| Publication Year | 1966 |
|---|---|
| Title | Geomagnetic polarity epochs: A new polarity event and the age of the Brunhes-Matuyama boundary |
| DOI | |
| Authors | Richard R. Doell, G. B. Dalrymple |
| Publication Type | Article |
| Publication Subtype | Journal Article |
| Series Title | Science |
| Series Number | |
| Index ID | 70010736 |
| Record Source | USGS Publications Warehouse |
| USGS Organization |