Lot 661
Near Complete Mesosaurus Skeleton - 260 Million Years Old. This excellent fossil of a 25 inch long marine reptile is both visually impressive, being nearly complete, and important for the information imparted by its geographical distribution. First of all, this small aquatic reptile was the very first known reptile to return to the sea 260 million years ago, shortly after evolving from amphibians. But even more importantly, it helps prove the theory of continental drift, as it is found only on the western part of
South Africa and the eastern part of South America. This proves that the two continents had to be connected 260 million years ago since this small reptile could not have swum across the Atlantic Ocean.
This near complete skeleton of Mesosaurus is from the Irati Formation of Brazil. The attractive brown bone is most notable in showing detail of the crocodile-like skull, including several small sharp teeth, with each tooth in its own socket. Also, the tail is complete except for the very end of the tip, which is rare in this type of fossil. Only the four limbs and feet are either missing or disarticulated. This impressive pre-dinosaur reptile is 25 inches long in its natural 20 x 10 inch limestone matrix. Weight is 12 pounds.
Estimated Value $1,500 - 2,200.
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