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LES TETRACORALLIAIRES (RUGOSA) DU CARBONIFERE INFERIEUR DU MASSIF ARMORICAIN (FRANCE)

Abstract : After a description of the geological setting and lithology of the Lower Carboniferous in the Armorican Massif, the terminology and method of Classification of the subclass Ru- gosa are defined. A systematic study of many specimens is presented ; a description of the external and internal morphology is given with accompanying illustrations. Methods of biometric analysis are also employed. The studied taxa belong to the Order Stauriida and we comprised within eight suborders which yield representatives of twelve families, viz : Stauriina (1 family : Amplexi- dae), Metriophyllina (1 family : Cyathaxoniidae), Stereolasmatina (3 families : Antiphyllidae, Hapsiphyllidae, Zaphrentoididae), Plerophyllina (2 families : Lophophyllidiidae, Hexalasmati- dae), Caniniina (1 family : Cyathopsidae), Londsdaleiina (1 family : Axophyliidae), Aulophyl- lina (2 families : Palaeosmiliidae, Aulophyllidae), Lithostrotionina (1 family : Lithostro- tionidae). In addition, there are forms of uncertain sub-order and family. 29 genera are described, including four new genera (NominotphyLLum, V tltpinoJULa f Solmnopkyltm, Sabolia), as well as 45 species (12 new). The descriptive chapter also includes data on the insertion of septa in Vtltpintlla aruutomo^a and some evolutive trends within the genera SlpkonopkylZia and kuJLo ko nincko pkyttum. The section on biostratigraphy sets on the vertical distribution of genera and species. An attempt is made to define biozones using species of Upper Tournaisien - Mid-Visean age. finally, various aspects of the palaeo-ecology of the Rugosa are discussed. An analysis of the ecology of preserved assemblages shows that certain types of corallites can characterize a particular environment, according to their internal and external features. Different assemblages of Rugose corals are recognized which appear to reflect different bathymetric conditions ; differences at the generic or specific level appear to result from the variable influence of environmental factors (water turbulence, oxygenation, salinity, sediment type). In this same chapter, comparisons are attempted with the fauna of other regions (Western Europe, North Africa, Eastern Europe and Asia). At the specific and generic level, strong similarities are apparent between the Armorican Massif and Western Europe, North Africa and even Siberia (Kuznetsk Basin).
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Claude Vuillemin. LES TETRACORALLIAIRES (RUGOSA) DU CARBONIFERE INFERIEUR DU MASSIF ARMORICAIN (FRANCE). Stratigraphie. Université de Rennes 1 [UR1], 1986. Français. ⟨tel-01757826⟩

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