Tonian
First period of the Neoproterozoic Era
Nº Q743343 ★★★
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Tonian
First period of the Neoproterozoic Era
The Tonian (from Ancient Greek: τόνος, romanized: tónos, meaning "stretch") is the first geologic period of the Neoproterozoic Era. It lasted from 1000 to 720 Mya (million years ago). Instead of being based on stratigraphy, these dates are defined by the ICS based on radiometric chronometry.
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From Wikipedia
The Tonian (from Ancient Greek: τόνος, romanized: tónos, meaning "stretch") is the first geologic period of the Neoproterozoic Era. It lasted from 1000 to 720 Mya (million years ago). Instead of being based on stratigraphy, these dates are defined by the ICS based on radiometric chronometry. The Tonian is preceded by the Stenian Period of the Mesoproterozoic Era and followed by the Cryogenian.
Text: Wikipédia, CC BY-SA 4.0. · Image: Scotese, Christopher R.; Vérard, Christian; Burgener, Landon... (CC BY 4.0) ·
