Etude de populations de Glycymeris (Bivalvia, Glycymerididae) du Miocène d'Aquitaine, Sud-Ouest de la France Studyof Glycymeris (Bivalvia, G1ycymerididae) populations from the Aquitaine Miocene, SW France

Abundant crops of Glycymeris have been made in the neritic bioclastic deposits of the Aquitaine Basin. After an outline about the Chattian taxa, the 5 Lower Miocene lineages are presented; G. cor is plainly predominant. Then, the Middle Miocene faunas are also detaiIed, G. inflatus and G. bimaculatus being the most frequent taxa. A test of biometrical analysis about the G. cor species is presented

Etude de populations de Glycymeris (Bivalvia, Glycymerididae) du Miocène d'Aquitaine, Sud-Ouest de la France

Abundant crops of Glycymeris have been made in the neritic bioclastic deposits of the Aquitaine Basin. After an outline about the Chattian taxa, the 5 Lower Miocene lineages are presented; G. cor is plainly predominant. Then, the Middle Miocene faunas are also detaiIed, G. inflatus and G. bimaculatus being the most frequent taxa. A test of biometrical analysis about the G. cor species is presented

A new Late Agenian (MN2a, Early Miocene) fossil assemblage from Wallenried (Molasse Basin, Canton Fribourg, Switzerland)

Excavations of two fossiliferous layers in the Wallenried sand- and marl pit produced a very diversified vertebrate fauna. New material allows the reassessment of the taxonomic position of the ruminant taxa Andegameryx andegaviensis and endemic Friburgomeryx wallenriedensis. An emended diagnosis for the second species is provided and additional material of large and small mammals, as well as ectothermic vertebrates, is described. The recorded Lagomorpha show interesting morphological deviations from other Central European material, and probably represent a unique transitional assemblage with a co-occurrence of Titanomys, Lagopsis and Prolagus. Rodentia and Eulipotyphla belong to typical and well-known species of the Agenian of the Swiss Molasse Basin. Abundant small mammal teeth have allowed us to pinpoint the biostratigraphic age of Wallenried to late MN2a. The biostratigraphic age conforms to data derived from the charophyte assemblages and confirms the oldest occurrence of venomous snake fangs. The palaeoenvironmental context is quite complex. Sedimentary structures and fauna (fishes, frogs, salamanders, ostracods) are characteristic for a humid, lacustrine environment within a flood plain system

Position stratigraphique de la "Molasse intermédiaire' ' du gisement à vertébrés de Lambert (Haute-Provence)

Stratigraphie position of "Molasse intermédiaire" in the loca¬ lity of Lambert (Haute Provence). A new datation is proposed for the "Molasse intermédiaire" from new fossil collected in 1989 in the locality of Lambert (Haute-Provence), on the basis of lagomorph and rodent associations.Les études préliminaires du matériel nouveau récolté à Lambert en 1989 permettent, sur la base des associations de Rongeurs et de Lagomorphes, de préciser l'âge de la "molasse intermédiaire".Ringeade Michel, Pages J.S. Position stratigraphique de la "Molasse intermédiaire' ' du gisement à vertébrés de Lambert (Haute-Provence). In: Géologie Méditerranéenne. Tome 17, numéro 1, 1990. pp. 101-106

A propos de l'Eusmilus (Eusmilus bidentatus ringeadei Ringeade et Michel, 1994) de Soumailles, lieu-dit de la commune de Pardaillan, Canton de Duras (Lot et Garonne, France) : étude descriptive

The well known site of Soumailles (Richard, 1946 ; Ringeade, 1967a and b, 1987) (a place near Pardaillan in Lot-et-Garonne, France) is stratigraphically situated just above the "Grande Coupure" of Sthelin (1909), at the base of the Lower Oligocene. The parts studied in this work from the almost complete skeleton belong to the genus Eusmilus (Carnivora Feliformia, Feloidea, Nimravidae - Martin, 1989 ; Wozencraft 1989 a and b-) which is one of the leaders of a new migration in Europe at that time. This Eusmilus from Soumailles is the oldest known in Europe for the genus. It presents many characters less progressive than the Eusmilus bidentatus from Villebramar (Brunet, 1972, 1979) or the Phosphorites ot Quercy (Piveteau, 1932) as well as the Eusmilus sicanus from North America (Scott and Jepsen, 1936). The Eusmilus from the Eocene of Lushih (Chow, 1958) is more primitive than the one from Soumailles and that seems to confirm the asiatic origin for the group. For these différents reasons and in wiew of its great stratigraphical age this specimen was attributed to a new subspecies : Eusmilus bidentatus ringeadei (Ringeade and Michel, 1994). Diagnosis : In order to simplify the Systematic classification we are keeping the bidentatus species name even though the Eusmilus from Soumailles has three upper incisors and three lower incisors. In comparison with the European Eusmilus, the specimen from Soumailles has : - a skull with a longer face and a foramen magnum placed higher, - a lower jaw with a flange process less high and not as short a massetenc fossa towards the front. Dentition : 3/3 I, 1/1 C, 3/1 P. 1/1 M Tree upper incisors and three lower incisors, upper canines smaller, narrower in the antero-posteriorly sense and less curved than those of the Eusmilus bidentatus from Villebramar or the Phosphorites of Quercy, there is an atrophied P2 (a lacteal tooth which could be present during all the animal's life time) The lower canine fang does not look like an 13. The Eusmilus from Soumailles is more plantigrade or less fleet of foot than all the actual big cats with retractiles claws. Type : An almost complete skeleton (vertebral column, ribs, fore and hind limbs) in anatomic order, with also : - One anterior fragment of a skull with right II, 12. 13. C. P2, P3, left alveoli of 12. 13. C. P2 and the left P3. - Posterior fragment of a skull, right P4 ; right lower jaw (with II, 12, 13, C, P4 et Ml ) and left lower jaw (with II, 12, 13 et C) ; -and, fragments of the left lower jaw with Ml and P4 ; Denvatio nominis : named Eusmilus bidentatus ringeadei nov. ssp. in homage to Mister Ringeade who excavated the site of Soumailles and discovered this Nimravidae. Locus typicus Soumailles (Lot-et-Garonne, France) stratigraphically situated just above the "Grande coupure" at the base of the Lower Oligocene (MP 21).Du célèbre gisement de Soumailles (Lot et Garonne - France) stratigraphiquement situé au-dessus de la "grande coupure" de Stehlin (base de l'Oligocène inférieur - MP 21) provient, de fouilles effectuées par M. Ringeade, un magnifique squelette quasi-complet, en connexion anatomique, d'un Feloidea du Genre Eusmilus. De par sa position stratigraphique et de par ses particularités morphologiques (moins progressif que les Eusmilus bidentatus des Phosphorites du Quercy ou de Villebramar) nous l'avons attribué à une nouvelle sous-espèce, à savoir Eusmilus bidentatus ringeadei.Ringeade Michel, Michel Patrick. A propos de l'Eusmilus (Eusmilus bidentatus ringeadei Ringeade et Michel, 1994) de Soumailles, lieu-dit de la commune de Pardaillan, Canton de Duras (Lot et Garonne, France) : étude descriptive. In: Paléo, n°6,1994. pp. 5-37