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Geological Society, London, Special Publications; 2007; v. 275; p. 275-281;
DOI: 10.1144/GSL.SP.2007.275.01.17
© 2007 Geological Society of London

Estimation of palaeoenvironmental changes: can analysis of distribution of tabulae in tabulates be a tool?

Mikolaj K. Zapalski1,2, Benoît Hubert2,3 & Bruno Mistiaen2

1 Warsaw University, Faculty of Geology, Zwirki i Wigury 93, 02-089 Warszawa, Poland
2 Laboratoire de Paléontologie stratigraphique FLST & ISA, UMR 8014 du CNRS, 41 rue du Port, 59046 Lille Cédex, France (e-mail: benhubert{at}free.fr)
3 Unité de Recherche de Pétrologie sédimentaire, B20, Université de Liège, Sart-Tilman B-4000 Liège

Growth periodicity (cyclomorphic variation) in corals is expressed by various features, among them changes in the distribution of tabulae. A method potentially useful in analysis of periodical environmental changes is proposed herein. Measurement of spaces between tabulae in tabulate corals and preparation of a histogram converted into a trend curve may show relative periodical fluctuations of the environment. Such an analysis, exemplified here on Givetian Pachyfavosites sp. from the Avesnois (northern France), shows that this method may be used as a tool for estimation of environmental changes.