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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.
- Tônico (geologia) – Wikipédia, a enciclopédia livre
Na escala de tempo geológico, o Tônico ( português...
- Stenian - Wikipedia
The Stenian Period ( / ˈstiːni.ən / STEE-nee-ən, from...
- Tônico (geologia) – Wikipédia, a enciclopédia livre
Upper GSSP ratified. 1992 [citation needed] The Neoproterozoic Era is the unit of geologic time from 1 billion to 538.8 million years ago. [2] It is the last era of the Precambrian Supereon and the Proterozoic Eon; it is subdivided into the Tonian, Cryogenian, and Ediacaran periods.
Tonian Period, earliest of the three periods of the Neoproterozoic Era, extending from 1 billion to about 720 million years ago. The interval’s starting and ending points were defined arbitrarily, with the end date roughly corresponding to the onset of the first recorded glacial episode about 750 million years ago.
- John P. Rafferty
Timeline of natural history. This timeline of natural history summarizes significant geological and biological events from the formation of the Earth to the arrival of modern humans. Times are listed in millions of years, or megaanni ( Ma ). Dating of the geologic record.
30 de ago. de 2018 · A recent study provides new details about the evolution of life on Earth during the Tonian Period, which spanned from 1000 to 720 million years ago. The Tonian occurred after a roughly one billion year stretch of time when the environment, life, and lithology of Earth was relatively stable.
