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The Tommotian Age began about 530 million years ago and is a subdivision of the early Cambrian. Named for rock exposures in Siberia, the Tommotian saw the first major radiation of the animals, or metazoans, including the first appearance of a great many mineralized taxa such as brachiopods, trilobites, archaeocyathids, molluscs, and echinoderms. A few million years before the Tommotian, in the Vendian, the continents had been joined in a single supercontinent called Rodinia. As the Cambrian began, Rodinia began to fragment into smaller continents which did not always correspond to the ones we see today. This site contains a map with a reconstruction that shows the rifting of Rodinia. There is also information about the climate as well as the location of some present day land masses at that time.
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