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Encyclopedia > Tonian

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). Instead of being based on stratigraphy, these dates are defined by the ICS based on radiometric chronometry. Geology (from Greek γη- (ge-, the earth) and λογος (logos, word, reason)) is the science and study of the Earth, its composition, structure, physical properties, history, and the processes that shape it. ... In geology, a period or age is a time span of many millions of years that are assumed to have had similar characteristics. ... The Neoproterozoic is the geological era from 1000 Ma to 542 Ma (million years ago). ... A geologic era is a subdivision of geologic time that is a separate classification that divides the Phanerozoic Eon into three parts timeframes. ... Annum is a Latin noun meaning year. ... Stratigraphy, a branch of geology, is basically the study of rock layers and layering (stratification). ... The International Commission on Stratigraphy concerns itself with stratigraphy on a global scale. ... Radiometric dating is a technique used to date materials based on a knowledge of the decay rates of naturally occurring isotopes, and the current abundances. ...


Events leading to the breakup of supercontinent Rodinia started in this period. In geology, a supercontinent is a land mass comprising more than one continental core, or craton. ... Depiction of Rodinia at time of initial breakup. ...


The first radiation of acritarchs occurred during the Tonian. Acritarchs are small organic structures found as fossils. ...


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

  Results from FactBites:
 
6moons audio reviews: Tonian Labs TL-R1 (2325 words)
Tonian Labs' Tony Minasian is of the opinion that there's nothing mystical or supernatural about super tweeters.
The Tonian Labs TL-R1 is essentially half of the TL-R2 that Michael Lavorgna reviewed in May. Where the R2 used a 5" pure ribbon tweeter, the R1 uses a 2.5-inch ribbon of the same design.
When using the resistor to attenuate the Tonian's tweeter, you connect the amplifier to the bottom dummy post and then use the resister to bridge across to the upper post, thereby completing the connection.
6moons audio reviews:Tonian Acoustics TL-R2 super tweeter (1607 words)
Tonian also makes two super tweeters; the TL-R2 using a 5" pure ribbon tweeter which is the subject at hand and the TL-R1 ($950/pair) which uses a 3" pure ribbon.
Tonian Laboratories was officially founded four years ago and has become the US importer for Supra Cables from Sweden, PHY-HP drivers from France and AER drivers from Germany.
The Tonian Acoustics speaker line has its origins in a certain dissatisfaction with the status quo.
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