Moontanman Posted November 12, 2010 Report Posted November 12, 2010 Cambrian Explosion: New Timeline for Appearances of Skeletal Animals in Fossil Record This is one of many spines that projected from the skin of an enigmatic animal in the group, Chancelloriidae, also from the earliest Cambrian period. (Credit: Susannah Porter) ScienceDaily (Nov. 10, 2010) — Beginning around 542 million years ago, a profusion of animals with shells and skeletons began to appear in the fossil record. So many life forms appeared during this time that it is often referred to as the "Cambrian Explosion." http://www.sciencedaily.com/releases/2010/11/101110091115.htm Quote
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