Observations sur quelques particularités de l'hydrographie de la Dombes et du sud de la Bresse

Dareste de la Chavanne J. Observations sur quelques particularités de l'hydrographie de la Dombes et du sud de la Bresse. In: Les Études rhodaniennes, vol. 16, n°2, 1940. pp. 69-74

Étude sur la faune du Bajocien supérieur du Mont d'Or lyonnais (Ciret). Gastéropodes, Lamellibranches, Brachiopodes, Echinodermes, Anthozoaires, Spongiaires (suite et fin)

, . Étude sur la faune du Bajocien supérieur du Mont d'Or lyonnais (Ciret). Gastéropodes, Lamellibranches, Brachiopodes, Échinodermes, Anthozoaires, Spongiaires (suite et fin) Lyon : Laboratoire de géologie de la Faculté des sciences de Lyon, 1936 (Travaux du Laboratoire de Géologie de la Faculté des Sciences de Lyon. Ancienne série, 28

Brachiopod palaeobiogeography in the western Tethys during the Early Jurassic diversity maximum: introduction of a Pontic Province

The biogeography of Pliensbachian (Early Jurassic) brachiopods in western Tethys is investigated using complementary multivariate tools including metric and non-metric ordination, additive cluster and bootstrapped spanning network analyses, as well as one-way analysis of similarity and similarity percentage analysis. All analyses were conducted using the Dice and Simpson similarity indices for presence/absence data on occurrence datasets involving 24 assemblages homogenized at the species level, including (403 taxa) or excluding (210 taxa) species found in only one assemblage. The analyses present a highly consistent biogeographical picture involving three main clusters: the Euro-Boreal, Mediterranean and Pontic biochores. The brachiopod species typical of the newly defined Pontic biochore are illustrated. The three assemblages from the Atlas area are interpreted as a fourth biochore, compositionally intermediate between those of the Euro-Boreal and Mediterranean. The Mediterranean biochore can be further divided into an intra- and a peri-Mediterranean group. These five, palaeogeographically well-constrained biochores show moderate to high degrees of species endemicity, ranging from 20% (Atlas) to 58% (Euro-Boreal). Based on available evidence, and after a reasonable cutback of the customary scale of ranks, the following biogeographical categories and names are suggested for the western Tethyan Pliensbachian brachiopod biochores: Euro-Boreal Province, Mediterranean Province (including an intra-Mediterranean and a peri-Mediterranean Subprovince), Pontic Province and Atlas Subprovince. In addition, a still poorly documented brachiopod biochore occurs on the Gondwana margin as a possible precursor of the extensive Middle to Late Jurassic Ethiopian Province