31 research outputs found
A review of the fossil record of turtles of the clade Pan-Carettochelys
Turtles of the total clade Pan-Carettochelys have a relatively poor fossil record that extends from the Early Cretaceous. The clade is only found in Asia during the Cretaceous, but spreads to Europe and North America during the Eocene. Neogene finds are restricted to Europe, Africa and Australia, whereas the only surviving species, Carettochelys insculpta, lives in New Guinea and the Northern Territories of Australia. The ecology of fossil pan-carettochelyids appears similar to that of the extant C. insculpta, although more primitive representatives were likely less adapted to brackish water. Current phylogenies only recognize three internested clades: Pan- Carettochelys, Carettochelyidae and Carettochelyinae. A taxonomic review of the group concludes that of 25 named taxa, 13 are nomina valida, 7 are nomina invalida, 3 are nomina dubia, and 2 are nomina nuda
Pre-permian Sedimentation in Nw Europe - Pre-permian Depositional-environments Around the Brabant Massif in Belgium, the Netherlands and Germany
Pre-Permian sedimentation in northwestern Europe has been controlled by the structural evolution of this area. Cambro-Silurian deposition has been influenced by partly synsedimentary movements (among others Ordovician-Silurian uplift south of the Brabant/Condroz zone, such as the Stavelot-Venn Massif).Presence, respectively absence of important late Caledonian deformation has subdivided northwestern Europe into three major sedimentary environments during the Devono-Carboniferous: the Caledonian fold belt and the Cornwall-Rhenish Basin which are separated by the Belgo-Dutch platform.Subsequently, the Hercynian or Variscan orogenies have gradually reduced the sedimentary area and produced the overall withdrawal of the marine environment. Eventually, large-scale overthrusts - such as the Dinant Nappe - masked parts of the original sedimentary basins