title: Paleomagnetic record of a geomagnetic field reversal from late miocene mafic intrusions, southern nevada.
abstract: Late Miocene (about 8.65 million years ago) mafic intrusions and lava flows along with remagnetized host rocks from Paiute Ridge, southern Nevada, provide a high-quality paleomagnetic record of a geomagnetic field reversal. These rocks yield thermoremanent magnetizations with declinations of 227 degrees to 310 degrees and inclinations of -7 degrees to 49 degrees , defining a reasonably continuous virtual geomagnetic pole path over west-central Pacific longitudes. Conductive cooling estimates for the intrusions suggest that this field transition, and mafic magmatism, lasted only a few hundred years. Because this record comes principally from intrusive rocks, rather than sediments or lavas, it is important in demonstrating the longitudinal confinement of the geomagnetic field during a reversal.
authors.forename: C D
authors.initials: CD
authors.lastname: Ratcliff
authors.forename: J W
authors.initials: JW
authors.lastname: Geissman
authors.forename: F V
authors.initials: FV
authors.lastname: Perry
authors.forename: B M
authors.initials: BM
authors.lastname: Crowe
authors.forename: P K
authors.initials: PK
authors.lastname: Zeitler