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This would explain the scarcity of egg fossils in the paleozoic amniote fossil record. [19] One Mesosaurus specimen called MCN-PV 2214 comprises a medium-size adult with a small individual in its rib cage which is interpreted as a fetus ‘in utero’, even suggesting that Mesosaurus like many other marine reptiles, gave live birth.
Fossil of a South American Mesosaur. The study of Laurin and Reisz (1995) was the second major phylogenetic analysis of amniotes. [18] Like Gauthier et al., Laurin and Reisz used Reptilia as a crown group and placed mesosaurs outside the group.
This list of fossil sites is a worldwide list of localities known well for the presence of fossils. Some entries in this list are notable for a single, unique find, while others are notable for the large number of fossils found there.
The Whitehill Formation has provided a variety of fossil insects, rare flora and Mesosaurus fossils, typical for the Permian of Gondwana. The mesosaurids are preserved as molds filled with gypsum crystals; they are commonly disarticulated. More rarely, casts of mesosaurids are found.
The Mangrullo Formation is part of the Cerro Largo Group of the Paraná Basin infill of South America. [5] Radiometric dating and fossil assemblage correlation with the Brazilian Irati Formation and the South African and Namibian Whitehill Formation, of the Paraná Basin and Karoo Basin respectively, puts it at around the Artinskian Age (about 279 ± 6 million years ago).
Fossil in the Royal Ontario Museum. Stereosternum tumidum was discovered by Edward Drinker Cope in 1886, while he was in Brazil and looking over some specimens housed in the Museu Nacional (Rio de Janeiro). When looking at the specimen, he noticed that the characteristics seen in Stereosternum were also seen in Mesosaurus.
The Late Carboniferous to Early Permian Ganigobis Formation has provided fossil fishes and the younger White Hill, Huab and Gai-As Formations of the Dwyka Group contain Mesosaurus fossils. The Mesozoic is represented by the Triassic Omingonde Formation comprising therapsid fossils and the Early Jurassic Etjo Sandstone with dinosaur trackways. [7]
Deutsch: Skelettabdrücke von Mesosaurus sp. in weißlich verwitternden Tonsteinen der Whitehill-Formation (Artinsk, Unterperm) bei Keetmanshoop im Südosten Namibias, Aranos-Becken English: Skeleton molds of Mesosaurus sp. in whitish weathering shales of the Whitehill Formation (Artinskian, Lower Permian) near Keetmanshoop in southeastern ...