アメリカ自然史博物館のインスタグラム(amnh) - 1月25日 06時24分

It's time for #TrilobiteTuesday! More than half a billion years ago things were far different in Siberia than they are today. Back in the Early Cambrian, the snow-swept steppes of the central Siberian plateau were located near the equator. What are now fossil layers were located just offshore of a large island-continent in the southern quadrant of the Panthalassic Ocean. It was apparently a very rich environment, one in which scientists now believe some of the first trilobites may have emerged. Siberian species such as Profallotaspis, Bigotina, and Bergeroniellus gurari, shown here, appear to stand at the very base of the entire trilobite family tree, creatures that some 521 million years ago provided ample proof that complex, multi-cellular life could indeed survive on this “hostile” planet called earth.

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