The Tonian (from Greek tonas, "stretch") is the first geologic period in the Neoproterozoic Era and lasted from 1000 Ma to 850 Ma (million years ago). Greek (el ελληνική γλώσσα or simply el ελληνικά — "Hellenic" is an Indo-European language, spoken today by 15-22 million people mainly Geology (from Greek γη gê, "earth" and λόγος Logos, "speech" lit The Neoproterozoic Era is the unit of geologic time from 1000 to 542 +/- 0 Annum is one form of the Latin noun meaning Year, not a form normally used for derivatives in modern languages the accusative singular Instead of being based on stratigraphy, these dates are defined by the ICS based on radiometric chronometry. Stratigraphy, a branch of Geology, studies rock layers and layering ( stratification) The International Commission on Stratigraphy (ICS, sometimes referred to by the unofficial " International Stratigraphic Commission " is a daughter or major Subcommittee Radiometric dating (often called radioactive dating) is a technique used to date materials usually based on a comparison between the observed abundance of a naturally occurring

Events leading to the breakup of supercontinent Rodinia started in this period. In Geology, a supercontinent is a Landmass comprising more than one Continental core or Craton. For the Genus of Metalmark butterflies, see Rodinia (butterfly.

The first radiation of acritarchs occurred during the Tonian. Acritarchs are small organic Fossils present from approximately to the present

References

• Tonian Period. GeoWhen Database. Retrieved on January 5, 2006.
• James G. Ogg (2004). "Status on Divisions of the International Geologic Time Scale.". Lethaia 37: 183–199. doi:10.1080/00241160410006492. A digital object identifier ( DOI) is a permanent identifier given to an Electronic document.  

Proterozoic eon
Paleoproterozoic era				Mesoproterozoic era			Neoproterozoic era
Siderian	Rhyacian	Orosirian	Statherian	Calymmian	Ectasian	Stenian	Tonian	Cryogenian	Ediacaran

The Proterozoic (ˌproʊtərəˈzoʊɪk is a geological eon representing a period before the first abundant complex life on Earth. The Paleoproterozoic (ˌpeɪlɪoʊˌproʊtərəˈzoʊɪk also spelled Palaeoproterozoic) is the first of the three sub-divisions ( eras) of the The Mesoproterozoic Era is a geologic era that occurred between 1600 Ma and 1000 Ma (million years ago The Neoproterozoic Era is the unit of geologic time from 1000 to 542 +/- 0 The Siderian (saɪˈdɪəriən sideros meaning "iron" is the first Geologic period in the Paleoproterozoic Era and lasted from 2500 The Rhyacian (raɪˈeɪsiən Ρυαξ ( rhyax) meaning "stream of Lava " is the second Geologic period in the Paleoproterozoic The Orosirian (ˌɒroʊˈsɪəriən oroseira - ὀροσειρά, meaning "mountain range" is the third Geologic period in the The Statherian (stəˈθɪəriən statheros, meaning "stable firm" is the final Geologic period in the Paleoproterozoic Era The Calymmian (from Greek calymma, "cover" is the first Geologic period in the Mesoproterozoic Era and lasted The Ectasian (from Greek ectasis, "extension" is the second Geologic period in the Mesoproterozoic era and lasted The Stenian (from Greek stenos, "narrow" is the final Geologic period in the Mesoproterozoic Era and lasted The Cryogenian (from Greek cryos "cold" and genesis "birth" is a Geologic period that lasted from. The Ediacaran Period (ˌiːdiˈækərən named after the Ediacara Hills of South Australia) is the last geological period of the Neoproterozoic

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