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.
|Title||Geomagnetic polarity epochs: A new polarity event and the age of the Brunhes-Matuyama boundary|
|Authors||Richard R. Doell, G. B. Dalrymple|
|Publication Subtype||Journal Article|
|Record Source||USGS Publications Warehouse|