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Bulletin de la Societe Geologique de France; January 2006; v. 177; no. 1; p. 19-26; DOI: 10.2113/177.1.19
© 2006 Societe Geologique de France
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Crinoid columnal associations and sequence stratigraphy architecture: the Le Faou Formation, Lower Devonian of the Massif armoricain (France)

Arnaud Botquelen1, Jean Le Menn1, Rémy Gourvennec1 and Alfredo Loi2

1 UMR 6538 « Domaines Océaniques », Paléontologie, UFR Sciences et Techniques, Université de Bretagne Occidentale, 6, Av. Le Gorgeu – C.S. 93837, 29238 Brest cedex 03, France. Arnaud.Botquelen{at}univ-brest.fr
2 Dipartamento di scienze della Terra, Università degli studi di Cagliari, via Trentino 51, I-09127 Cagliari, Italie

Crinoid columnals are major macrobenthic components of the Lower Devonian faunas of the Massif armoricain particularly in the Seillou section. Three crinoid columnal associations have been delineated based on R and Q-mode cluster analysis. Distribution of these associations is correlated to the sequence stratigraphic architecture, showing the close relationships between crinoid columnal association dynamics and relative sea-level variations. Comparing the distribution of benthic associations, we note a lesser diversity in crinoid columnal associations than in brachiopod ones. Crinoids (high-level suspension feeders) seem to occupy broader specialised niches than brachiopods (reclining and low-level suspension feeders) and are characterised by a different ecological space utilisation.

Key Words: Crinoid columnals • Relative sea-level variations • Terrigenous platform • Lower Devonian • Massif armoricain






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