Unique Fossils Capture ‘Cambrian Migration’

A unique set of fossils indicates that 525 million years ago marine animals congregated in Earth's ancient oceans, most likely for migration, according to an international team of scientists. Fossil evidence of collective behavior is extremely rare. But what makes the find even more intriguing is that it indicates that such behavior was occurring at the beginning of the 'Cambrian explosion' -- a major event that saw a vast profusion of complex organisms enter the fossil record for the first time.

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