Proterozoic


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Related to Proterozoic: Cambrian, Geological time scale

Proterozoic

[¦präd·ə·rə¦zō·ik]
(geology)
Geologic time between the Archean and Paleozoic eras, that is, from 2500 million to 550 million years ago. Also known as Algonkian.
References in periodicals archive ?
It is noteworthy that during the seismic survey preceding the borehole location, an inclined boundary between the Proterozoic and Archaean complexes was drawn along the Luchlompolo fault and the real contact between these complexes was interpreted as the boundary between gneisses and underlying rocks of the granulite-basalt layer (Kozlovsky, 1987).
The brittle nature of the structures containing the veins and the intense hematitization suggest that this deposit type may be Proterozoic.
Proterozoic prokaryotes: affinities, geologic distribution, and evolutionary trends.
The Project consists of some of the most under-explored Proterozoic mineral belts in Australia and is part of the Arunta geological region, a Proterozoic domain covering a large part of Central Australia.
Geological Survey, explained that the connection between zinc limitation and the evolution of eukaryotes was based largely on the hypothesis that Proterozoic oceans were broadly sulfidic.
50 Ga granitic plutons and revealed extensive involvement of the middle Proterozoic basement in the central Himalayan collision zone.
1981, Upper Proterozoic glaciogenic rocks and their stratigraphic significance: Precambrian Research, v.
1985, Discovery of two Proterozoic granite-rhyolite terranes in the buried mid-continent basement: the case for shallow drill holes, in Raleigh, B.
2 billion years ago, during Earth's Proterozoic era.
The Proterozoic uranium-vanadium deposits are worked in the Mounana area between Franceville and Lastourville by the Compagnie des Mines d'Uranium de Franceville (Comuf), in which Cie Francaise de Mokta has a 39% interest, the Gabon Government 24.
To date, mineralization in this zone has been traced by local artesian miners for over 100 kilometres and occurs in Proterozoic highly metamorphic rocks adjacent to the central Tanzanian Archean Craton.
Reconstruction of a Late Proterozoic to Devonian Continental Margin Sequence, Northern Alaska, Its Paleogeographic Significance, and Contained Base-Metal Sulfide Deposits