Proterozoic

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Proterozoic

that period of geological time lasting from some 2600 million to 589 million years ago; the part of Cryptozoic time excluding the Archaean Period. Fossils dating from this period are mainly CYANOBACTERIA.
References in periodicals archive ?
The development of the Mianyang-Changning intracratonic sag significantly influenced the Late Proterozoic to Early Cambrian oil/gas occurrences in the Sichuan basin, that is, chiefly through its influence on the distribution of high-quality reservoirs in the Late Proterozoic Dengying and Early Cambrian Longwangmiao formations and of source-rocks in the Niutitang Formation.
Late Proterozoic rocks of Nagar Parkar, southeastern Pakistan: A preliminary petrologic account, In: Ahmed, R.
Late Proterozoic and Silurian alkaline plutons within the southeastern New England Avalon zone.
The southern Appalachian Blue Ridge is composed predominantly of late Proterozoic metaclastic and metavolcanic units overprinted by a mid-Paleozoic dynamothermal event that recrystallized these units to a range of metamorphic grades.
It has always been thought that the Earth completely froze twice during the late Proterozoic era between 600 and 800million years ago.
The Pampean cycle developed during the Late Proterozoic. It shows a collisional heft at the easternmost part of the Sierras Pampeanas, with a series of mafic and ultramafic rocks associated with tectonites.
Basement exposures in southwestern Rhode Island are dominated by multiply deformed late Proterozoic to late Paleozoic plutonic and metasedimentary rocks [ILLUSTRATION FOR FIGURE 1 OMITTED].
Exploration is also continuing in the late Proterozoic complexes, notably in the alkaline Gardar Province of South Greenland.
Then sometime during the late Proterozoic era, about 580 million years ago, life got big.
The Nagar Parkar Igneous Complex (NPIC) is considered as an extension of the Late Proterozoic Malani Igneous suite (MIS) of western Rajasthan.