The Tommotian Age is an early part of the Cambrian period. In this age, animals diversified into groups like the trilobites, mollusks, and echinoderms.
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The relationships of Tommotian animals to living groups are not understood, but it is likely that mollusks also evolved at this time.
The Tommotian animals disappeared rather quickly and were followed by the "Cambrian Explosion" of modern groups in the last half of the Early Cambrian (Atdabanian Age).
During the first 10 million years of the Cambrian Period the Tommotian fauna was replaced by a more diverse biota of larger metazoans participating in more complex communities.
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