| Tommotian |
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Information AboutTommotian |
| CATEGORIES ABOUT TOMMOTIAN AGE | |
| cambrian | |
| SHOPPER'S DELIGHT | |
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PALEOGEOGRAPHY World Climate during the Tommotian was mild; there was no Glaciation . Most of North America lay in warm southern tropical and temperate latitudes, which supported the growth of extensive shallow-water Archaeocyathid reefs all through the Lower Cambrian . Siberia , which also supported abundant Reefs , was a separate continent due east of North America. Baltica - what is now Scandinavia, eastern Europe, and European Russia - lay to the south. Most of the rest of the continents were joined in a supercontinent known as proto- Gondwana . What is now China and east Asia was fragmented at the time. Western Europe was also in pieces, with most of the pieces lying northwest of what is now the north African coastline. FAUNA The Tommotian saw the rise of diversified , Molluscs , Annelid s, Lobopod s, and other forms that do not seem to belong to any recent phylum. Many of these organisms were recognized either as of unknown affinity or as representatives or groups that became extinct before the end of the Cambrian. The most primitive stage is marked by characteristic elements, such as Anabaritid s, Tommotiid s, and Hyolithellid s, also known as the ''"Tommotian fauna"''. The origin of the many kinds of skeletons during this time was a major evolutionary development. The rapid evolution of a variety of external skeletons was probably in response to the evolution of advanced predators. REFERENCES
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