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T. liorhinus

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The layers show a change in evolution over time. At the beginning with the Thrinaxodon, it was small and had a short and straight tail. 

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The layers show a change in evolution over time. At the beginning with the Thrinaxodon, it was small and had a short and straight tail. 

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Over around 20 million years later there was the Cynodont looks like the Thrinaxodon but is a little bit bigger and the tail became longer and not as straight.

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Moving on to present day to the alligator, it has similar patterns to the Thrinaxodon such as the teething, but it is much larger than the fossil and the tail is much more curved.