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Previous HitMagneticNext Hit Polarity Stratigraphy of the Permian and Carboniferous: The Extension of the Previous HitMagneticNext Hit Reversal Record into the Paleozoic

OPDYKE, NEIL D., University of Florida, Gainesville, FL

Previous HitMagneticNext Hit polarity stratigraphy has revolutionized stratigraphic studies in Jurassic to Pleistocene sediments. These studies have been greatly facilitated by the reversal record that is recorded in rocks of the ocean floor. For times prior to the Jurassic, the reversal history of the Previous HitmagneticNext Hit field must be determined and eventually related through the type section concept.

The Previous HitmagneticNext Hit reversal history of the late Paleozoic is dominated by the Permo-Carboniferous reversed superchron (PCRS), which extends from the late Permian to the Carboniferous (Westphalian). Recent studies by the author and his students in Middle Carboniferous sediments of eastern Canada, Pennsylvania, Arizona, and Nevada reveal that the Previous HitmagneticNext Hit field has reversed frequently in late Mississippian and early Pennsylvanian times (Meramecian through late Morrowan). The polarity of the Previous HitmagneticNext Hit field over this interval is approximately 50% normal and 50% reversed. The frequency of reversal appears to be about one reversal per m.y. The possibility, therefore, exists that this pattern may be used for continental and intercontinental correlation. Attempts are currently underway to correlate this Previous HitmagneticTop stratigraphy to fossiliferous marine sections. The base of the PCRS is probably of Atokan age.


AAPG Search and Discovery Article #91004 © 1991 AAPG Annual Convention Dallas, Texas, April 7-10, 1991 (2009)