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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.
- Stenian
The Stenian Period ( / ˈstiːni.ən / STEE-nee-ən, from...
- Otavia Antiqua
The oldest fossils are from the Tonian period, before the...
- Stenian
Tonian Period, earliest of the three periods of the Neoproterozoic Era, extending from 1 billion to approximately 720 million years ago. It immediately followed the Stenian Period of the Mesoproterozoic Era (which lasted from 1.2 billion to 1 billion years ago) and was succeeded by the Cryogenian Period (approximately 720 million to ...
- John P. Rafferty
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Tonian Period. c. 1,000 Ma – Neoproterozoic Era and Tonian Period start. Grenville orogeny ends. First radiation of dinoflagellates and spiny acritarchs – increase in defensive systems indicate that acritarchs are responding to carnivorous habits of dinoflagellates – decline in stromatolite reef populations begins.
The Tonian was the first geological period in the Neoproterozoic era. It lasted from 1000 million years ago (mya) to 720 mya. The supercontinent Rodinia began breaking in this period. Acritarchs radiated during the Tonian.
Aug 30, 2018 · The Tonian represents an important period in Earth’s history because changes in the global environment are thought to correspond to a time of evolutionary innovation for life. Studying the Tonian can provide insight in the co-evolution of the planet and the biosphere.
by Pinal Geology Museum. August 16, 2023. The Tonian Period is a geologic period that is part of the Neoproterozoic Era. It lasted from approximately 1 billion to 720 million years ago. The Tonian represents a time of transition between the earlier Proterozoic Eon and the more complex life forms that emerged later.
