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The Tonian (from Greek tonas, "stretch") is the first geologic period in the Neoproterozoic Era and lasted from 1000 Ma to 850 Ma (million years ago). Instead of being based on stratigraphy, these dates are defined by the ICS based on radiometric chronometry. Events leading to the breakup of supercontinent Rodinia started in this period. The first radiation of acritarchs occurred during the Tonian.

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  • Tonian
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  • The Tonian (from Greek tonas, "stretch") is the first geologic period in the Neoproterozoic Era and lasted from 1000 Ma to 850 Ma (million years ago). Instead of being based on stratigraphy, these dates are defined by the ICS based on radiometric chronometry. Events leading to the breakup of supercontinent Rodinia started in this period. The first radiation of acritarchs occurred during the Tonian.
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  • The Tonian (from Greek tonas, "stretch") is the first geologic period in the Neoproterozoic Era and lasted from 1000 Ma to 850 Ma (million years ago). Instead of being based on stratigraphy, these dates are defined by the ICS based on radiometric chronometry. Events leading to the breakup of supercontinent Rodinia started in this period. The first radiation of acritarchs occurred during the Tonian.
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