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naturally occurring polymorphs of calcium carbonate
Age:Late Jurassic
Lower Cretaceous of about 110 million years ago
The fossil aroused much controversy
Propalaeotherium, Messel Horse Skeleton Troodon naturally occurring polymorphs of calciumSixty one complete skeletons of primitive horses have been found so far at the Messel site. The most common species is Eurohippus parvulus, with 44 specimens found, which was about the size of a fox terrier (30 35 cm high at the shoulder). Less common Propalaeotherium hassiacum, with 15 specimens found, was about the size of a german shepherd. Only two specimens of Hallensia matthesi have been found (its size was intermediate to the other two
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