Skip to main content
U.S. flag

An official website of the United States government

Geomagnetic polarity epochs: A new polarity event and the age of the Brunhes-Matuyama boundary

January 1, 1966

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