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DIACHRONISM OF KEY FOSSIL STRATIGRAPHIC MARKERS IN THE MESOZOIC: CONSEQUENCES FOR THE GEOLOGIC TIME SCALE AND FOR PALEOENVIRONMENTAL CHANGE

Abstract : Diachronism is a well-known issue in stratigraphy. In the case of various macro-and microfossil groups, several statistical methods such as constrained optimization (CONOP) or unitary associations have been proposed to remedy such issues and improve the Geologic Time Scale. The purpose of the latter methods is to examine misfits, eliminate problematic bio-events in favor of the most reliable biostratigraphic markers and to draw the best statistical or optimal biostratigraphic series. Such methods do not attempt, however, to quantify diachronism nor to understand its possible causes besides issues linked to preservation, inadequate sampling or incorrect dating. The integration of numerous stratigraphic techniques (chemostratigraphy, magnetostratigraphy, high-precision radiometric dating and cyclostratigraphy) allows today a much better characterization of potential diachronism in some of the key stratigraphic macro-and microfossil marine groups. Here, we will examine case-studies from the Mesozoic where well-demonstrated examples of diachronism call for a modification of some of the “standard” marine microfossil zones but also trace paleoenvironmental change. Rather than to be considered as a pitfall, more emphasis should be put on potential diachronism as it can improve both stratigraphy and our understanding of ocean currents, climate, continent configuration and/or sea-level change.
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https://hal-insu.archives-ouvertes.fr/insu-01718225
Contributor : Isabelle Dubigeon <>
Submitted on : Tuesday, February 27, 2018 - 11:13:25 AM
Last modification on : Monday, January 20, 2020 - 1:58:03 PM

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  • HAL Id : insu-01718225, version 1

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Nicolas Thibault, Mathieu Martinez. DIACHRONISM OF KEY FOSSIL STRATIGRAPHIC MARKERS IN THE MESOZOIC: CONSEQUENCES FOR THE GEOLOGIC TIME SCALE AND FOR PALEOENVIRONMENTAL CHANGE. International Meeting of Sedimentology 2017, Oct 2017, Toulouse, France. pp.879. ⟨insu-01718225⟩

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