The Tommotian is a Siberian stratigraphy floor. This floor forms the lower part of the Cambrium and is named for the village of Tommot by the Aldan River.
Age is around 540 million years, but the dates vary. The total time span represented by the floor is probably no longer than 3 million years.
In the Siberian stratigraphy, the Tommotian follows the Nemakit-Daldynian and is followed by the Atdabanian. In older proposals for the global geological time scale, the Tommotian was used as Cambrim's earliest timeframe. It followed in such proposals on the Poundian (nowadays part of the Ediacarium system) and was succeeded by the Atdabanian. Because Cambodian stratigraphy is difficult to correlate globally, there were still few subdivisions of Cambrium officially recorded in 2008. As the bottom of the Cambrium, Fortunien is used today.
The name Tommotian is often used in the paleontology of the unique fauna (Archaeocyatha, Mollusks and Brachiopods) from the Siberian floor.
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