The Tonian (from Ancient Greek: τόνος, romanized: tónos, meaning "stretch") is the first geologic period of the Neoproterozoic Era. It lasted from 1000...

Precambrian Supereon and the Proterozoic Eon; it is subdivided into the Tonian, Cryogenian, and Ediacaran periods. It is preceded by the Mesoproterozoic...

Neoproterozoic era and the Tonian period. The supercontinent Rodinia assembled during the Stenian. It would last into the Tonian period before breaking up...

the sponge-like organism Otavia has been dated all the way back to the Tonian period, but its identity as an animal is heavily contested. Nearly all modern...

Namibia in which the fossils were found. The oldest fossils are from the Tonian period, before the Cryogenian glaciations, but the latest found were from...

private college in downtown Los Angeles. The college was founded in 1969 by Tonian Hohberg, the institute's president and CEO. In 2023, Arizona State University...

forms the second geologic period of the Neoproterozoic Era, preceded by the Tonian Period and followed by the Ediacaran. The Cryogenian was a time of drastic...

whole were small, unicellular, and simple (Ediacaran fauna and earlier Tonian Huainan biota being notable exceptions). Complex, multicellular organisms...

of species described. It has also been found in sediments dating to the Tonian (~1,000 million years ago). Cyclomedusa was originally thought to be a jellyfish...

as 1 billion years ago though they probably became multicellular in the Tonian. Trace fossils such as tracks and burrows found in the late Neoproterozoic...

the supercontinent of Rodinia, a state of affairs which lasted until the Tonian about 750 million years ago when it broke up, and Siberia became part of...

(Canadian Arctic) with fungal affinity. c. 1,000 Ma – Neoproterozoic Era and Tonian Period start. Grenville orogeny ends. First radiation of dinoflagellates...

appeared. Cryogenian: The middle period in the Neoproterozoic Era: 635-720 Ma. Tonian: the earliest period of the Neoproterozoic Era: 720-1000 Ma. Mesoproterozoic:...

deposits of China (Huainan City, Anhui Province) with an age of 840-740 Ma (Tonian). A similar biota was also found by M. B. Gnilovskaya in Russia, on the...

geologic time scale based on the rock record to bring it in line with the post-Tonian geologic time scale. This work assessed the geologic history of the currently...

Orosirian Statherian Mesoproterozoic Calymmian Ectasian Stenian Neoproterozoic Tonian Cryogenian Ediacarian Phanerozoic Paleozoic Cambrian Cambrian Explosion...

of extremely low atmospheric oxygen spanning from the Statherian to the Tonian, the NOE was the second major increase in atmospheric and oceanic oxygen...

subdividing the three systems of the Neoproterozoic (Ediacaran, Cryogenian and Tonian) into stages too. Systems can include many lithostratigraphic units (for...

Neoproterozoic (539 Ma–1 Ga) Ediacaran (539–635 Ma) Cryogenian (635–720 Ma) Tonian (720 Ma–1 Ga) Mesoproterozoic (1–1.6 Ga) Stenian (1–1.2 Ga) Ectasian (1...

Neoproterozoic (539 Ma–1 Ga) Ediacaran (539–635 Ma) Cryogenian (635–720 Ma) Tonian (720 Ma–1 Ga) Mesoproterozoic (1–1.6 Ga) Stenian (1–1.2 Ga) Ectasian (1...

Neoproterozoic (539 Ma–1 Ga) Ediacaran (539–635 Ma) Cryogenian (635–720 Ma) Tonian (720 Ma–1 Ga) Mesoproterozoic (1–1.6 Ga) Stenian (1–1.2 Ga) Ectasian (1...

Neoproterozoic (539 Ma–1 Ga) Ediacaran (539–635 Ma) Cryogenian (635–720 Ma) Tonian (720 Ma–1 Ga) Mesoproterozoic (1–1.6 Ga) Stenian (1–1.2 Ga) Ectasian (1...

years ago. More recently, Aspidella fossils have been found in the mid-Tonian-aged Heavitree Formation, Amadeus Basin, Central Australia, dated to ~ 850 million...

Neoproterozoic (539 Ma–1 Ga) Ediacaran (539–635 Ma) Cryogenian (635–720 Ma) Tonian (720 Ma–1 Ga) Mesoproterozoic (1–1.6 Ga) Stenian (1–1.2 Ga) Ectasian (1...

Neoproterozoic (539 Ma–1 Ga) Ediacaran (539–635 Ma) Cryogenian (635–720 Ma) Tonian (720 Ma–1 Ga) Mesoproterozoic (1–1.6 Ga) Stenian (1–1.2 Ga) Ectasian (1...

Neoproterozoic (539 Ma–1 Ga) Ediacaran (539–635 Ma) Cryogenian (635–720 Ma) Tonian (720 Ma–1 Ga) Mesoproterozoic (1–1.6 Ga) Stenian (1–1.2 Ga) Ectasian (1...

Neoproterozoic (539 Ma–1 Ga) Ediacaran (539–635 Ma) Cryogenian (635–720 Ma) Tonian (720 Ma–1 Ga) Mesoproterozoic (1–1.6 Ga) Stenian (1–1.2 Ga) Ectasian (1...

Neoproterozoic (539 Ma–1 Ga) Ediacaran (539–635 Ma) Cryogenian (635–720 Ma) Tonian (720 Ma–1 Ga) Mesoproterozoic (1–1.6 Ga) Stenian (1–1.2 Ga) Ectasian (1...

Mesoproterozoic waters, which at the time were low on oxygen. Eventually, during the Tonian period (Neoproterozoic era), oxygen levels increased and the crown eukaryotes...

before the freezing millions: Evolutionary patterns and innovations in the Tonian Period". Emerging Topics in Life Sciences. 2 (2): 161–171. doi:10.1042/ETLS20170165...