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・ Tonia, Greater Poland Voivodeship
・ Tonia, Lesser Poland Voivodeship
Tonian
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・ Tonic (radio program)
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Tonian : ウィキペディア英語版
Tonian

The Tonian (from Greek ''tonas'', "stretch") is the first geologic period in the Neoproterozoic Era and lasted from Mya to Mya (million years ago). Instead of being based on stratigraphy, these dates are defined by the ICS based on radiometric chronometry.
Events leading to the formation of supercontinent Rodinia started in this period(Rodinia and Stenian wiki pages, help clarify? ).
The first radiation of acritarchs occurred during the Tonian.
== References ==

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