A Triassic, Jurassic and Cretaceous Time Scale
Published:January 01, 1995
Felix M. Gradstein, Frits P. Agterberg, James G. Ogg, Jan Hardenbol, Paul Van Veen, Jacques Thierry, Zehui Huang, 1995. "A Triassic, Jurassic and Cretaceous Time Scale", Geochronology, Time Scales and Global Stratigraphic Correlation, William A. Berggren, Dennis V. Kent, Marie-Pierre Aubry, Jan Hardenbol
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We present an integrated geomagnetic polarity and stratigraphic time scale for the Triassic, Jurassic, and Cretaceous Periods of the Mesozoic Era, with age estimates and uncertainty limits for stage boundaries. The time scale uses a suite of 324 radiometric dates, including high-resolution 40Ar/39Ar age estimates. This framework involves the observed ties between (1) radiometric dates, biozones, and stage boundaries and (2) between biozones and magnetic reversals on the seafloor and in sediments. Detailed attention is given to chronostratigraphic calibration of stage boundaries using tethyan and boreal biozonations. Interpolation techniques to arrive at a geochronology include maximum likelihood estimation, smoothing cubic spline fitting, and magnetochronology. The age estimates for the 31 stage boundaries (Ma with uncertainty in my to 2 standard deviations), and the duration of the preceding stages (in my) are:
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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.