Index fossils dating

A distinct proterosuchid trait is the peculiar hook-shaped mouth.With its short tail and toothless beak, Confuciusornis is very modern looking compared to Archaeopteryx.

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Index fossils dating

Together with Ichthyostega the sole early labyrinthodont known from fairly complete skeletons.

It is the oldest animal known to have feet rather than fins, thus making it a true tetrapod and the oldest known unquestionable ichthyostegalian.

Scientists say there are two implications for palaeontology.

Firstly they provide new evidence for the 'Out of Africa' theory - that modern humans evolved only in Africa and not in several places around the world.

This is a tentative partial list of transitional fossils (fossil remains of groups that exhibits both "primitive" and derived traits).