Cambrian Explosion of Life: the Big Bang in Metazoan Evolution
نویسنده
چکیده
Despite the protracted history of life on earth spanning well over 3.8 Ga, fossil record of the Precambrian (>543 Ma) largely documents only microscopic life. The mostly simple Precambrian life forms were followed by a sudden explosive radiation of multicellular animals at the turn of the Cambrian period (543-490 Ma) between 530 and 520 Ma ago, when almost two-thirds of the animal phyla make their dramatic appearance in the fossil record. This unusual and amazing burst of macroevolutionary change is called the Cambrian explosion.
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