Aretz et al_2011.pdf - ORBi - Université de Liège

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Kölner Forum Geol. Paläont., 19 (2011)
M. ARETZ, S. DELCULÉE, J. DENAYER & E. POTY (Eds.)
Abstracts, 11th Symposium on Fossil Cnidaria and Sponges, Liège, August 19-29, 2011
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tabulates. Favositidae are not significantly changing. Like the Michelinidae, they are not recorded after the
Brigantian. The pattern indicates that the recognized Favositidae (Emmonsia, Squameofavosites, Sutherlandia)
are conservative taxa. The small colonies live predominanty in deeper-water and also in muddy
environments and, obviously, are less controlled by facies changes or sealevel changes than the two other
families, which prefer carbonate environments. The differing diversity curves of the families also indicate a
declining disparity during the later Mississippian. Communicate fasiculate taxa (Multithecoporidae) gain
predominance in the Pennsylvanian of the western Palaeotethys.
Fig. 1. (A) Normalised diversity of all tabulate corals, and of the three families Favositidae, Michelinidae and
Syringoporidae; error bars represent the confidence interval at 95%; St: Strunian, Has: Hastarian, Ivo: Ivorian, Moli:
Molinacian, Li: Livian, As: Asbian, Bri: Brigantian, Mos: Moscovian, Kasi: Kasimovian. (B) Cluster showing the
faunal similarities between the considered geographic units; node supports at 1000 bootstrap replicates.
Palaeogeographic and facies relations: Major clusters indicate certain faunistic differences between the
northwestern European carbonate platform (British Isles, Belgium) and a northeastern European carbonate
realm (Poland), both situated on the southern Laurussian shelf (Fig. 1B). The northeastern European
carbonate realm differs mostly by the existence of Roemeriidae, Multithecoporidae and Sinoporidae, by
more diverse Syringoporidae and less diverse Michelinidae from the northwestern European platform. A
second cluster embraces the Rhenohercynian Zone (Rhenish Slate Mts., Southern Portugal) and Catalonia.
However, it is considered as facies group, characterized by mixed siliciclastic-carbonate deposits and
pelagic carbonates. This is a typical Cyathaxonia facies with common Favositidae (Sutherlandia ssp.) and the
Palaeacid Smithinia humilis (Hinde).
ARETZ, M. (2010): Habitats of colonial rugose corals: the Mississippian of western Europe as example for a general
classification. – Lethaia, 43: 558-572.
COOPER, A. (2004): Measures of biodiversity. – IN: WEBBY, B.D., PARIS, F., DROSER, M.L. &PERCIVAL, I.G. (EDS.), The Great
Ordovician Biodiversification Event, 52-57; New York (Columbia Press).
HLADIL, J. (1987): The lower Famennian tabulate corals from southern Moravia. – Vestnik Českého geologického ústavu
(=Bulletin of the Czech Geological Survey), 62: 41-46.
SCRUTTON, C.T. (1997): The Palaeozoic corals, I: origins and relationships. – Proceedings of the Yorkshire Geological
Society, 51: 177-208.
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