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Brazil calcite and quartz
Perchoerus - peccary
Illinois
Dinosaur Eggshell
Crocodile teeth
Trematochamsid crocodile
Ginglymostoma moroccanum
Media
Brachiopods
Fossil Egg Shell
Echinoids
Echinoderms
Coral
Nautiloids
Elrathia kingii - fossil trilobite
Phacops
Bivalves - France

Reptiles evolved from amphibians approximately 310 million years ago during the Pennsylvanian Period. Unlike their amphibian ancestors, reptiles were able to spend their entire lives on land due to an impermeable skin and durable, leathery eggshells. Reptiles were the dominant terrestrial vertebrates during the Mesozoic Era and gave rise to birds and mammals during that time.



Reptiles



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