How To Use Proterozoic In A Sentence
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They demonstrate that the orogen likely developed over a Neoproterozoic failed continental rift that was linked to the breakup of the supercontinent Rodinia.
EurekAlert! - Breaking News
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The record has been much deformed, reconstituted, and obliterated during the subsequent Proterozoic and Phanerozoic eons.
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This in turn surrounds less common remnants of Proterozoic sediments.
Australian Fossil Mammal Sites, Australia
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Archaean and Proterozoic basement terranes are commonly dissected by swarms of Precambrian mafic dykes.
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Knoll and Carroll think there was a mass extinction event at the Proterozoic-Cambrian border.
Continuation…
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The assembly and regulatory diversification of the genetic toolkit for animal development undoubtedly underpin Proterozoic and Cambrian evolution …
Continuation…
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Paleoproterozoic igneous and metamorphic rocks along with Paleozoic sedimentary rocks make up the basement complex of the San Juan Mountains of southwestern Colorado.
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The late Neoproterozoic is an important period of biological evolution; and the emergence of metazoa is a representative event, which marked the history of biology evolution having entered a new era.
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proterozoic life forms
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Major crustal rifting has also played a part in the evolution of large bodies of Proterozoic sedimentary and igneous rocks.
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Stage 2 includes deposition of the latest Neoproterozoic Lake Maurice and Ungoolya Groups, which predate and span the initial stages of the Petermann Orogeny.
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These thrust sheets were considered until recently to represent segments of the late Ncoproterozoic rifted margin of Baltica, the opposing rift margin to East Greenland in conventional palaeocontinental reconstructions.
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Scattered throughout the Mojave Desert, outcrops of Proterozoic sedimentary rock make up parts of the mountain ranges that divide this region into basins.
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The global context of glaciation in the Neoproterozoic is the massive first-order reorganization of the planet's geography, climate and ocean systems resulting from the breakup and dispersal of the supercontinent Rodinia.
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In amongst the wildly contorted Proterozoic strata, we spotted small fish, an assortment of hermit crabs (Pagurus spp.), small spider crabs (Libinia spp.), and a number of different taxa of cancroids, including juvenile Rock crabs (Cancer irroratus).
"Here, by the ocean, the sky's filled with leaves..."
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ChronologyThe data of chronology explanates that both of them are belong to Proterozoic Era.
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Another important difference is that the basement of one of the Menderes nappes (dine nappe, see below) is of Neoproterozoic to Cambrian age.
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Nevertheless, particularly for the study trace fossils at the Neoproterozoic-Cambrian, I find it preferable to look for similarities, and to critically evaluate the taphonomy of each morphological feature.
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Acritarchs continue to be used in studies of Proterozoic paleoecology and stratigraphy, even though their systematic affinities are still not well understood.
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The late Neoproterozoic Doushantuo Formation in South China contains several exceptionally preserved biotas in its cherts, phosphorites, and black shales.
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The southern Adelaide Fold Belt is part of a Neoproterozoic to Early Palaeozoic orogen that extended over 5000 km along the southeastern edge of the early Gondwana supercontinent.
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All of the acicular crystals are late Neoproterozoic
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Late Proterozoic, so let's say 1,000 to 542.0 million years ago.
Of Books and the Sea
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The Proterozoic, Archean and Hadean are often collectively referred to as Precambrian Time, and sometimes also as the Cryptozoic.
Table of geologic time - The Panda's Thumb
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Recent palaeogeographical reconstructions of the Neoproterozoic North Atlantic tract relate formation of the Baltoscandian margin to the fragmentation of the supercontinent Rodinia into Baltica, Laurentia and Siberia.
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Farther east, the abundance of rift tholeiites and associated high-temperature picritic lavas suggests proximity to break-up and formation as part of a Neoproterozoic SDRS package.
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The Proterozoic aeon (2,500-540 million years ago) saw episodic increases in atmospheric oxygen content.
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Following, or partly during, their amalgamation, the terranes of the Arabian shield were covered by younger Neoproterozoic volcanic and sedimentary rocks and intruded by relatively undeformed granitoid and subordinate gabbroid rocks.
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Eukaryotic one-celled organisms became dominant in the Proterozoic Eon.
Geologic time
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The Northern Inner Piedmont (45e) is characteristically underlain by highly deformed and deeply weathered Cambrian and Proterozoic feldspathic gneiss, schist, and melange.
Ecoregions of Delaware, Maryland, Pennsylvania, Virginia, and West Virginia (EPA)
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The key to understanding the early evolution of eukaryotes lies in the Proterozoic fossil record, especially microfossils.
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Acritarchs continue to be used in studies of Proterozoic paleoecology and stratigraphy, even though their systematic affinities are still not well understood.
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Horodyski, R.J., 1977, Environmental influences on columnar stromatolite branching patterns: Examples from the Middle Proterozoic Belt Supergroup, Glacier National Park, Montana: Journal of Paleontology, v. 51, p.
Glacier National Park Geology & Paleontology: Part 2 - Prichard and Altyn
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The contrasting Neoproterozoic and Early Palaeozoic histories of the various Variscan terranes of Europe provide a key to palaeogeographical reconstructions.
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Precambrian divisions such as the Proterozoic and the Archean were conventionally eras but are now often referred to as eons.
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The apparent increase of carbonaceous macrofossils through the Proterozoic Eon is likely a result of combined biological and environmental evolution.
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The xenocrysts provide evidence that earlier Neoproterozoic rocks were present in the region and that locally rocks date back to 1929 Ma.
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The record has been much deformed, reconstituted, and obliterated during the subsequent Proterozoic and Phanerozoic eons.
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Boron deposits of eastern Liaoning occur in a suite of Early Proterozoic metamorphic rocks, with boron orebodies existent in magnesian marble.
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Wholerock and chromite geochemistry suggests that these rocks have greatest affinity with picrites found on King Island, which have a latest Neoproterozoic age.
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The Takwa mineral occurrence is hosted by a flat-lying Proterozoic sedimentary basinal sequence spatially associated with an angular unconformity with Archean basement rocks.
Marketwire - Breaking News Releases
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The fossil record shows that the first eukaryotic life appeared on Earth at the beginning of the Proterozoic aeon, about two gigayears ago, when the Earth was only about half its present age.
George’s Cosmic Treasure Hunt
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We parked and spent the afternoon on the rocky beaches, surrounded by high granite cliffs (an unnamed granite formation dating from the Late Proterozoic), searching for bits of beach glass.
"We've been watching you with all our eyes..."
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Subsequently, between the Late Proterozoic and the Mesozoic, the rocks throughout the region suffered periodic episodes of deformation.
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The zircon data clearly lead to the conclusion that a Proterozoic terrane is the main detritus source because of the preponderance of grains from this age.
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In Proterozoic carbonaceous fossils, ultrastructural and biochemical characters are unavailable, and anatomical and reproductive structures are uncommon.
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Acraman occurs in the Gawler Range Volcanics, a Mesoproterozoic continental suite of mainly acid lavas and ash flows.
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Late Archean and Early Proterozoic were the main period for the formation of continental crust.
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In contrast, the Cambrian clastic rocks are characterized by a paucity of these zircons, suggesting a significant difference between Neoproterozoic and Cambrian drainage systems.
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Probably formed in Early Proterozoic, it was rejuvenated repeatedly in late stage.
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The Arunta Inlier is an extensive east-west-trending, polyphase, high-grade, predominantly Palaeoproterozoic metamorphic complex.
