Platecarpus ictericus, mosasaur skull, marine reptile Protoceratops They appeared at the start

They appeared at the start of the Cambrian period and flourished throughout the lower Paleozoic era before beginning a drawn-out decline to extinction when the last of the trilobites disappeared in the mass extinction at the end of the Permian 250 million years ago (m

very reptile-like tetrapods that lived during the Early Permian

The poster is printed on heavy-duty 110 pound

Diplocynodon was very similar to the modern Caimen

Sao Mateus del Sol

Platecarpus ictericus, mosasaur skull, marine reptile Protoceratops They appeared at the startMosasaurs were a group of predatory marine reptiles that were very successful during the Late Cretaceous Period. The first mosasaur fossils were found in the 1770's in a mine in the Netherlands, more than 50 years before the first dinosaur bones were found. Mosasaurs were among the first fossils recognized and scientifically described. "Mosasaur" means "reptile of the Meuse," a river near the quarry where mosasaurs were first found. Mosasaurs were