Development of the Jurassic geochronologic scale

Pálfy, József (1995) Development of the Jurassic geochronologic scale. Hantkeniana, 1. pp. 13-25. ISSN 1219-3933

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Abstract

A reliable geochronologic scale is necessary for many aspects of Jurassic research. Time scales are built from chronostratigraphicallyconstrainedisotopic dates. An overview of Jurassic time scales published between 1964 and 1994 demonstrates significant differences in the estimated ages of stage boundaries. Apart from the evolution and growth of the isotopic age database, most of the discrepancies can be explained by differing approaches to data selection, the handling of uncertainties, and procedures for boundary estimation and interpolation. A fundamental shortcoming of all Jurassic scales proposed to date remains the inadequate number of isotopic dates used. Current and future research needs to generate new data which can resolve the ambiguities of currently competing scales. Significant improvements are expected through the preferential use of precise and accurate U-Pb or ^Ar-^’Ar dating of samples which are biochronologically constrained at the zonal level.

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