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about 225 million years ago
and mosasaurs
efremovi was about 23 to 26 feet long and weighed 2 to 3 tons
but recently paleontologists have concluded that perhaps the extant genus Gopherus existed in the Oligocene as well
has studied this specimen briefly
Sclerocephalus hauseri, Amphibian Skeleton Pteranodon about 225 million years agoScientific Name: Sclerocephalus hauseri, Amphibian Skeleton Location: Germany Age: 280 MYA, Permian SCALE IS 1 METER Sclerocephalus is an extinct genus of temnospondyl amphibian from the lowermost Permian of Germany with four valid species, including the type species S. haeuseri. It is one of the most completely preserved and most abundant Palaeozoic tetrapods. Sclerocephalus was once thought to be closely related to eryopoid temnospondyls, but it is
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