News From the Field
Researchers Find Earliest Evidence for Animal Life
February 4, 2009
An international team of scientists has found the oldest evidence for animals in the fossil record. The researchers examined sedimentary rocks in south Oman, and found an anomalously high amount of steroids that date back to 635 million years ago, to around the end of the last ice age. The steroids are produced by sponges. The discovery of the sponges is evidence for multicellular animal life beginning 100 million years before the Cambrian explosion.
University of California, Riverside
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