The earliest marine reptiles evolved from land reptiles roughly 240 million years ago., Over the last 10 to 20 years, we have begun to look more closely at fossils found in marine sediments, Marine reptiles were actually the first big prehistoric reptiles discovered by fossil hunters., Mosasaurus was a real sea monster., Mosasaurs were first discovered in Europe, but the most and some of the best have been found here in Kansas., How long did they live?,

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