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22 – FOSSILS CONTINENTAL DRIFT

CONTINENTAL DRIFT

Fossilized leaves of the deciduous tree Glossopteris browniana of Upper Permian age from Illawarra Coal Measures, Dunedoo, New South Wales, Australia. Distribution of Glossopteris fossils supports the theory of continental drift through deep time and the existence of the ancient supercontinent of Gondwana. Deposited in the Permian Period, 245 to 286 million years ago. Specimen courtesy of Terry Manning, Leicester, England--please credit both the photographer and specimen provider. — AUS-0009_fossil-leaves.jpg

Original fossil of a mesosaur, Stereosternum tumidum, from Permian age deposits of the Irati Formation, in the State of Sao Paulo, Brazil. The length of the skull of this specimen is 6.0cm. Mesosaurs were freshwater crocodile-like reptiles that lived during the early Permian (between 286 and 258 million years ago), are found solely in Southern Africa and Eastern South America. It would have been physiologically impossible for mesosaurs to swim between the continents. This suggests that South America and Africa were joined during the Early Permian, forming the Gondwana supercontinent. This specimen is in the collection of the Black HIlls Institute of Geological Research, photographed with written permission for commercial educational use. Along with credit to the photographer, please include a "specimen courtesy of" credit to the Black Hills Institute of Geological Research. — TAW-3825_mesosaur-fossil_flat

Fossilized leaves of the deciduous tree Glossopteris browniana of Upper Permian age from Illawarra Coal Measures, Dunedoo, New South Wales, Australia. Specimen on display in the Museum of Ancient Life / Thanksgiving Point Institute, Lehi, Utah, USA. — TAW-3645_Glossopteris-fossil.jpg

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