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Tonian Facts for Kids. Homework Help - Kiddle Encyclopedia.
Tonian facts for kids
Kids Encyclopedia Facts - Homework Help
The Tonian was the first geological period in the Neoproterozoic era. It lasted from 1000 million years ago (mya) to 850 mya. The supercontinent Rodinia began breaking in this period. Acritarchs radiated during the Tonian.