Neil D. Opdyke, 1995. "Magnetostratigraphy of Permo-Carboniferous Time", Geochronology, Time Scales and Global Stratigraphic Correlation, William A. Berggren, Dennis V. Kent, Marie-Pierre Aubry, Jan Hardenbol
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New data has recently become available on the length and duration of the Permo-Carboniferous reversed superchron (PCRS, Kiaman). This data set is reviewed, and the upper boundary is found to occur at approximately 260 Ma and the lower boundary at about 315 Ma. The frequency of reversal before and after the onset of the PCRS is similar to that observed before and after the Cretaceous quiet zone (KQZ). The earth’s magnetic field seems to have two states, one with reversal frequencies exceeding 1 per million years and the other with no or few reversals for 10’s of millions of years. The KQZ occurred at a time of continental dispersal and the PCRS at a time of continental amalgamation.
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Geochronology, Time Scales and Global Stratigraphic Correlation
Geochronology, Time Scales, and Global Stratigraphic Correlation - The last decade has witnessed significant advances in analytic techniques and methodologic approaches to understanding earth history. This publication is a well-constructed geochronologic framework that allows estimation of rates of geologic processes, correlation of stratigraphies, and placement of discrete events in temporal order. Resulting from a research symposium at the 67th Annual SEPM meeting in New Orleans, Louisiana, April 1993, the 16 papers of this volume represent a broad spectrum of approaches to understanding earth history and the passage of geologic time.