Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- adjective Of, relating to, or being the oldest of the three eras of the Proterozoic Eon, from approximately 2.5 billion to 1.6 billion years ago, marked by the formation of stable continents and the appearance of cyanobacteria.
- noun The Paleoproterozoic Era.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective geology Of a
geologic era within theProterozoic eon ; comprises theSiderian ,Rhyacian ,Orosirian andStatherian periods from about 2500 to 1600 million years ago, whencyanobacteria increased the amount ofoxygen in theatmosphere and changedlife onEarth for ever. - proper noun geology The Paleoproterozoic era.
Etymologies
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Examples
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The lower Lesser Himalayan sequence: A Paleoproterozoic arc on the northern margin of the Indian plate
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The lower Lesser Himalayan sequence: A Paleoproterozoic arc on the northern margin of the Indian plate
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Increases in the overall maximum occurred in discrete steps approximately corresponding to increases in atmospheric oxygen levels in the mid-Paleoproterozoic and Ediacaran-Cambrian - early Ordovician.
Pharyngula 2009
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Increases in the overall maximum occurred in discrete steps approximately corresponding to increases in atmospheric oxygen levels in the mid-Paleoproterozoic and Ediacaran-Cambrian - early Ordovician.
Planet Atheism 2009
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The Sudbury impact layer in the Paleoproterozoic iron ranges of northern Michigan,
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