How To Use Precambrian In A Sentence
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The effects of UV on microorganisms growing under conditions prevalent during the early Precambrian Aeon are examined.
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Paleobotany: Sedimentary rocks show pollen in very deep, "Precambrian" strata.
CreationWiki - Recent changes [en]
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Some Late Precambrian Ediacaran fossils bear strong resemblances to colonial coelenterates called sea pens.
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The mountain ranges (sky islands) are a geologic mix of Tertiary volcanic and intrusive granitic rocks, Paleozoic sedimentary layers, and some Precambrian granitic plutonic rocks.
Ecoregions of New Mexico (EPA)
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Archaean and Proterozoic basement terranes are commonly dissected by swarms of Precambrian mafic dykes.
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I know it's not as well understood - but what is the approximate time frame over which carbon dioxide values returned to normal after the catastrophic deglaciations in the late Precambrian?
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Substrate here consists largely of hard, slow-weathering Precambrian quartzose rocks.
Tasmanian temperate rain forests
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At the foot of Hance Rapid, the river leaves Marble Canyon; its regular and stately sandstones, shales, limestones, and quartzites tower higher and higher above, while the river quickly incises itself a thousand feet into the black and pegmatite-veined Precambrian schists of the Inner Gorge.
President Garfield's "spine, removed during autopsy, was passed around to jurors during the trial of his assassin."
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The first extinction of the Precambrian, which largely affected stromatolites and acritarchs, has been correlated with a large glaciation event that occurred about 600 million years ago.
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Most amphibole asbestos was mined as crocidolite and amosite from Precambrian banded ironstones in South Africa and, to a lesser extent, Western Australia.
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Precambrian metamorphism and migmatization and the wide spectrum of mainly Alpine mica ages provide clear evidence for such a polyphase geological history.
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The Grenadiers consist of upthrusted blocks of Precambrian Quartzite and slate.
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The ancient Brazilian shield underlying the forest presents a gently undulating plain framed by scenic quartzitic ridges and mountains of Precambrian origin aligned in a generally NW to SE direction.
Chiquitano dry forests
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The up-to-date stratigraphy and earlier radiometric dates on these and other Late Precambrian rocks of this area are given in Pharaoh & Gibbons.
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In fact, there are fossil microbes known from throughout the Precambrian, but here a second problem surfaces - how do you distinguish fossil archaeans from fossil bacteria?
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A craton includes a crystalline basement of commonly Precambrian rock called a shield, and a platform in which flat-lying or nearly flat-lying sediments or sedimentary rock surround the shield.
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It was Sederholm's task to try to elucidate the complex rocks of the Finnish Precambrian basement.
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If a single mammalian fossil were found in situ in precambrian rock strata, evolution would be falsified.
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The spherules in South Greenland are the first distal impact ejecta recognized in mid-Precambrian strata.
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The prominent basement rocks of the Brumado area are Precambrian in age and consist dominantly of gneisses, schists, and amphibolite.
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Rock weathering must have been very different in the early Precambrian because iron is soluble in such water and can easily be transported.
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PS I mapped a few thousand sq miles of late Precambrian in the Richtersveld, just inside South Africa years ago, which was older than the Nama and included the Numees tillite in which I found a stromatolite in associated dolomite, and also a dropstone and varves.
The Cambrian as an evolutionary exemplar - The Panda's Thumb
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Because of this, clay becomes progressively less common in older geological periods and is almost never found in Precambrian formations.
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The surroundings are low heavily glaciated PreCambrian gneiss and amphibolite rocks extending some 50 km inland to the ice cap with flanking lateral moraines and ice-dammed lakes; also lakelets, glacial striations, roches moutonées, and perched erratics typical of glaciated landscapes.
Ilulissat Icefjord, Denmark-Greenland
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Most amphibole asbestos was mined as crocidolite and amosite from Precambrian banded ironstones in South Africa and, to a lesser extent, Western Australia.
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The rugged, steeply sloping mountains are composed of Precambrian amphibolite and gneiss.
Ecoregions of North Carolina and South Carolina (EPA)
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Originally there were only two eons, the Precambrian and the Phanerozoic.
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This is strikingly similar to the Company's "Mockingbird" Gold Property geology, where the gold is also hosted in lower plate Precambrian gneiss, and is frequently associated spatially with lamprophyre dikes.
Marketwire - Breaking News Releases
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On shore, 5 m sand dunes and alluvial sands and gravels overlie relatively recent sedimentary, Tertiary clastic and PreCambrian crystalline rocks.
Islands and Protected Areas of the Gulf of California, Mexico
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The mountains are comprised of acid plutonic and volcanic rocks belonging to the Precambrian basement complex of the southern part of the Sinai Peninsula.
Red Sea Nubo-Sindian tropical desert and semi-desert
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It has a similar strike but steeper dip and extends to anticipated Precambrian basement depths.
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The mountains show a relief with extensive outcropping of Precambrian, acidic rocks.
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In an 1872 paper, he identified the circular imprints as "small ovate fossils" of some unknown Precambrian organism - perhaps a kind of mollusk - and sketched a picture of the find.
Dose.ca Music briefs
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In addition to the dominant Precambrian and Paleozoic rocks, there are small deposits of Mesozoic rocks on the island as well.
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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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The first 3 eons are part of a time interval known as Precambrian time 4 billion-year interval with very few fossils.
Recently Uploaded Slideshows
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Turquoise here was found as vein fillings and nodules in weathered Precambrian granite.
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Williams, include oceanic crust and mantle rock exposed by the obduction process of plate tectonics, as well as sedimentary rock formed during the Ordovician, Precambrian granite and
WN.com - Business News
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Darwin predicted that precursors to the trilobite would be found in pre-Silurian rocks … Similarly, Darwin predicted that Precambrian fossils would be found.
Blast From the Past
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The Canadian Shield (aka the Precambrian Shield, or Laurentian Shield) is the Precambrian rock that covers about 8 million square kilometers of Eastern and Central Canada.
2009 July « Mudpuddle
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Ecoregion 66c is underlain by Precambrian metamorphic rock, including quartzite, graywacke, and conglomerate of the Lynchburg Formation.
Ecoregions of Delaware, Maryland, Pennsylvania, Virginia, and West Virginia (EPA)
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(551-2500 million yrs BP) Also known as Precambrian Eukaryotic cell organisms develop.
Geologic time
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A craton includes a crystalline basement of commonly Precambrian rock called a shield, and a platform in which flat-lying or nearly flat-lying sediments or sedimentary rock surround the shield.
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The thick Thunderhead Sandstone (Upper Precambrian Great Smoky Group) in the Great Smoky Mountains along the Tennessee/North Carolina border was deformed and regionally metamorphosed during formation of the Appalachian Highlands, beginning in the so-called Devonian (that is, early in the Flood year).12-14 With increasing temperatures and pressures from northwest to southeast, the regional metamorphism produced in these sandstone layers a series of chemically and mineralogically distinct zones of schists and gneisses.15 These zones are named according to the first appearance of the distinctive metamorphic minerals which characterize them as the intensity of the metamorphism increased laterally—the biotite, garnet, staurolite, and kyanite zones.
Ken Miller in Cleveland: WEBCAST ARCHIVE URLS - The Panda's Thumb
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Similarly, Darwin predicted that Precambrian fossils would be found.
Blast From the Past
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Cryic soils developed on the mixed geology of mostly Tertiary volcanics and Tertiary intrusives, with only minor areas of Precambrian rocks in the Black Range.
Ecoregions of New Mexico (EPA)
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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 Black Hills are a maturely dissected domal uplift with an exposed core of Precambrian rocks; encircling hogbacks, enclosed hogbacks, and enclosed strike valleys rim the province.
Black Hills Coniferous Forest Province (Bailey)
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Their principal outcrops constitute the great Precambrian shields of continental crust upon which later formations were deposited.
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The Mount Nimba range is a 40 km-long narrow ridge running southwest to northeast, part of a Guinean mountain backbone bordering Sierra Leone and Liberia, of Precambrian basement rock, predominantly granites.
Mount Nimba Strict Nature Reserve, Guinea and Côte d'Ivoire
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Apparently, taconite is a Precambrian sedimentary rock—whatever that means—which is usually made up of about 25 to 30 percent iron ore.
Heaven’s Fury
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Like most of us, however, I was too distracted or polite to point out that the Precambrian, as the Smithsonian admitted in a letter to Stufflebeam, denotes not a specific era but a "dimensionless unit of time, which embraces all the time between the origin of Earth and the beginning of the Cambrian Period of geologic time.
Thursday Breakfast Bender
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Scattered outcrops of very basic serpentinite also occur. formations predominate and Precambrian gneisses are common in the east.
Ecoregions of Delaware, Maryland, Pennsylvania, Virginia, and West Virginia (EPA)
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There are a few Precambrian fossils that have been found, so the “explosion” in the Cambrian period has been exaggerated by Creationists to decieve people. hoary puccoon
Well that was interesting - The Panda's Thumb
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The oldest anthozoans are probably some of the polyp-like and sea pen-like fossils from the Vendian (late Precambrian).
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There are many belts of greenstone (highly contorted, Precambrian volcanics and sediments) throughout the Canadian Shield.
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Lower Cambrian and subordinate Precambrian strata are mainly metamorphic marine clastic deposits and underlie parts of the western section of the county.
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A variety of sedimentological criteria, including petrography, texture, lithology and sedimentary structures, must be applied in the environmental analysis of Precambrian arenites.
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Geologically, the ecoregion overlies a mixture of Precambrian basement rocks, and a number of post-Jurassic sedimentary basins.
East Sudanian savanna
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Despite our lack of knowledge, or perhaps because of it, researchers have divided the Precambrian into three time periods called eons.
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Northern Finland is part of the Precambrian Fennoscandian shield.
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Despite our lack of knowledge, or perhaps because of it, researchers have divided the Precambrian into three time periods called eons.
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Subordinate rocks include thin units of dolomite, evaporite, Varangerian tillite and Precambrian crystalline rocks.
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The main effect of the orogeny in southeastern Utah was to uplift the Uncompahgre High, a horst composed of Precambrian strata, which is bound on its southwestern flank by a major reverse fault.
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I mean it is Pretty Freakin’ Classified and though we have been called a Precambrian Folklore Collection some think we are more like a Positive Frenzied Circasaurus.
PFC Performing Arts group in Norman, OK
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There is ample evidence to support this hypothesis, including recent genomic discoveries concerning the evolution of fundamental structures including bilateralism which is now know to precede the Precambrian.
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