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The change of bryozoan fauna in the upper valanginian of the alpes de haute provence parallelism with the crisis observed in the jura at the same time


, : The change of bryozoan fauna in the upper valanginian of the alpes de haute provence parallelism with the crisis observed in the jura at the same time. Cretaceous Research 12(6): 597-606

In the upper Valanginian (Marnes a Toxaster and Grande Lumachelle) of the Alpes-de-Haute-Provence [France] the succession of two bryozoan faunas is observed. Among the reasons for the change of fauna, the replacement of a muddy bottom in calm water (Marnes a Toxaster) by a sandy-shelly bottom in rather agitated water (Grande Lumachelle) is certainly important, but these modifications are the result of more general events. The change of fauna could be compared with the one that took place at the beginning of the Trinodosum Zone in the Jura. The fauna of the Marnes a Toxaster (Verrucosum Zone) shows some characteristic species of the "faune 1" of the Jura and, moreover, the same two dominating species. The muddy basin environment of the Marnes a Toxaster, unlike the carbonate platform environment in the Jura, involves only a specific impoverishment. As for the fauna of the Grande Lumachelle, it is totally identical to the "faune 2" found in the Marnes a bryozoaires and the Calcaire a Alectryonia of the Jura. This parallelism of the two faunas with those of the Jura, in spite of the differences of sedimentary facies, shows the change of the fauna now observed over about 400 km, has the same principal cause. Thus it seems possible to extend the cooling hypothesis I have proposed for the Jura, to Provence.

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DOI: 10.1016/0195-6671(91)90033-9


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