High resolution biostratigraphy of the Tournaisian-Viséan boundary interval in the North Staffordshire Basin and correlation with the South Wales-Mendip Shelf

 

Authors: Kalvoda J, Bábek O, Aretz M, Cossey P, Devuyst FX, Hargreaves S, Nudds J

Published in: Bulletin of Geosciences, volume 87, issue 3; pages: 497 - 541; Received 25 January 2012; Accepted in revised form 23 May 2012; Online 15 August 2012

Keywords: Tournaisian, Viséan, foraminiferal biostratigraphy and ecology, carbonate sedimentology, gamma-ray spectrometry,

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Abstract

A study of three carbonate sections in the North Staffordshire Basin and two in the South Wales-Mendip Shelf yielded so far the richest foraminiferal associations at the Tournaisian-Viséan boundary in Western Europe enabling a very good correlation with the stratotype area in South China. The biostratigraphic study was refined by sedimentological and gamma-spectrometrical data in order to define and calibrate the high resolution biostratigraphy across the boundary interval. The study illustrates the cryptic entry of the stratigraphically important species of the Chadian index genus Eoparastaffella which is abundant in photozoan facies. Across the Tournaisian-Viséan boundary, changes in the character of the foraminiferal associations reflect the gradual change from heterozoan dominated late Tournaisian ramps to Viséan photozoan dominated platforms. The combined application of biostratigraphic and sedimentological methods and gamma ray manifestation of the mid Avonian sequence boundaries have proved useful in the identification of the Tournaisian-Viséan boundary in Carboniferous successions on either side of the Wales-Brabant Massif and has widespread applicability for successions of a similar age across Western Europe.

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