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Sentence Examples Despite our lack of knowledge, or perhaps because of it, researchers have divided the Precambrian into three time periods called eons. The prominent basement rocks of the Brumado area are Precambrian in age and consist dominantly of gneisses, schists, and amphibolite. Turquoise here was found as vein fillings and nodules in weathered Precambrian granite. The effects of UV on microorganisms growing under conditions prevalent during the early Precambrian Aeon are examined. Rock weathering must have been very different in the early Precambrian because iron is soluble in such water and can easily be transported. Subordinate rocks include thin units of dolomite, evaporite, Varangerian tillite and Precambrian crystalline rocks. The studied sequence at the transition to the axial zone in NE Sardinia is estimated to have a Precambrian to Palaeozoic age. In addition to the dominant Precambrian and Paleozoic rocks, there are small deposits of Mesozoic rocks on the island as well. It has a similar strike but steeper dip and extends to anticipated Precambrian basement depths. This idea is difficult to test, because data on Palaeozoic and Precambrian facies trends and structures are limited. Archaean and Proterozoic basement terranes are commonly dissected by swarms of Precambrian mafic dykes. The Grenadiers consist of upthrusted blocks of Precambrian Quartzite and slate. The mountains show a relief with extensive outcropping of Precambrian, acidic rocks. Their principal outcrops constitute the great Precambrian shields of continental crust upon which later formations were deposited. The crest of the Blue Ridge is usually underlain with Precambrian or Cambrian igneous rocks. It was Sederholm's task to try to elucidate the complex rocks of the Finnish Precambrian basement. Some Late Precambrian Ediacaran fossils bear strong resemblances to colonial coelenterates called pennatulids, or sea pens. Plenty of suitable sedimentary deposits exist within the late Precambrian and Cambrian strata. It extends upwards from a depth of about 6 km, at which depth Precambrian crystalline basement is predicted from seismic refraction studies. The bedrock ranges in age from Precambrian to Mississippian, but Cambrian, Ordovician, and Devonian rocks predominate. Show More Sentences Precambrian divisions such as the Proterozoic and the Archean were conventionally eras but are now often referred to as eons. Because of this, clay becomes progressively less common in older geological periods and is almost never found in Precambrian formations. Precambrian rocks are those formed before the beginning of the Cambrian period, about 590 million years ago. Foothills composed of Precambrian schists and gneisses lie west of the hogbacks, and the Great Plains physiographic province lies to the east of the Table Mountains. Precambrian metamorphism and migmatization and the wide spectrum of mainly Alpine mica ages provide clear evidence for such a polyphase geological history. They analyzed veins of rock that had been formed by flash heating in a Precambrian terrane in Norway. The region is characterized by low relief, complex drainage and a typical low arctic tundra vegetation in the Precambrian Shield. Crude chronologies of these rocks of the Precambrian Eon are provided by different radiometric dating techniques. The rock of the Precambrian Shield is very near the surface in this region and only a scrubby coniferous growth is supported. Outcropping shards of the underlying Precambrian rock seem a strikingly rugged intrusion into such a soft landscape. In general these rift basins are poorly exposed and form low-relief areas surrounded by rugged hills composed predominantly of Precambrian to Mesozoic rocks. As steroid biosynthesis requires molecular oxygen, fossil steranes have been used to draw inferences about aerobiosis in the early Precambrian. Hadean Eon, informal division of Precambrian time occurring between about 4.6 billion and about 4.0 billion years ago. The first two eons comprise the Precambrian, the most ancient period of time, which accounts for over five-sixths of all geologic ages. The region is part of the Appalachian peneplain, which is composed predominantly of a mix of late Precambrian sedimentary and volcanic rocks. This conclusion is not accepted by everyone in the surprisingly vigorous and contentious field of Precambrian biogeochemistry. The ELA is located on the Precambrian Shield of North-western Ontario, approximately 250 km east of Winnipeg and 50 km east-southeast of Kenora. Although these banded rocks are not organic, they do look like the banded stromatolites now known from the Precambrian of the Canadian Shield. A dark blue colour is introduced to highlight lower Paleozoic offshelf units in the Phanerozoic orogens surrounding the Precambrian craton. The Precambrian is followed by the Phanerozoic, which is divided into three eras: the Paleozoic, Mesozoic and Cenozoic eras. Show More Sentences The Ediacaran or Vendian has variously been considered the terminal system of the Precambrian or the first of the Phanerozoic. Since roughly the 1980s, trace fossils have been used with limited precision to correlate uppermost Precambrian and basal Cambrian strata. He grew into an expert woodsman as he hammered the rocks to probe the hidden Eldorado beneath the grim mantle of the Precambrian Shield. The parent rocks of the gneisses were argillaceous, Al-poor dolomitic greywackes probably of Precambrian age. Cliffs forming the margins of rifts are thought to have developed in this way, with retreat occurring since the Late Cretaceous in Precambrian to Palaeozoic rocks. This tectonostratigraphy contains metamorphic rocks of both early Palaeozoic and Precambrian age with metamorphic grade generally increasing to the west. Most of the material derives from the granitic rocks of the Precambrian Shield far to the north. In North America, I was familiar with the geology of Precambrian deposits, but a tropical setting changed quickly my perception. Consequently, Precambrian time has not been subdivided to the same degree of precision as more recent times. A picket line was also set up in front of BHP's headquarters in the Precambrian building. It is about 1.2 km north of the airfield, in a region characterized by sedimentary and volcanic rocks of Precambrian age. The bare Precambrian granite of the Canadian Shield forms much of Lake Superior's shoreline and the north shore of the Upper and Lower estuaries. From east to west through the southern half of Manitoba, rocks of Precambrian, Paleozoic and Cretaceous ages occur. Precambrian bedrock is solid material, which allows only low water movements and small water quantity. Most amphibole asbestos was mined as crocidolite and amosite from Precambrian banded ironstones in South Africa and, to a lesser extent, Western Australia. Lower Cambrian and subordinate Precambrian strata are mainly metamorphic marine clastic deposits and underlie parts of the western section of the county. Rocks of late Precambrian and early Paleozoic age have yielded a variety of tiny spine-like fossils of dominantly organic or weakly phosphatic composition. An organism that may be ancestral to the trilobites, as well as to other arthropods, may be represented by Spriggina, which is known from Precambrian shallow-water marine deposits in Australia. Initially, in a generalized outline of the Precambrian history of the region, the Vishnu Schist was upraised, folded, and metamorphosed and then slowly eroded and worn down to a flat surface. Petrographical and petrochemical features of the Estonian Precambrian porphyraceous potassium granites. Show More Sentences Aquifers and aquitards in the study area occur mainly in Pleistocene glacial sediments and in underlying Paleozoic carbonate, sandstone, shale, and Precambrian rocks. Sometimes the Hadean, Archean and Proterozoic are lumped together in a supereon called the Precambrian. A variety of time scales has been used for assigning isotopically dated rocks to the appropriate subdivision or time unit of the Phanerozoic and Precambrian time scales. Sponges are among the oldest known multicellular animals, sponge spicules have been found in Precambrian rock layers more than 600 million years old. Eozoon canadense was later determined not to be a fossil, but similarly banded stromatolite fossils, an example of which is on the same shelf, are now known from Precambrian rocks as old as 3.4 billion years. Porphyritic, aplitic, and granitic bodies of this type are common in Precambrian, mainly Archean, terrains and in younger rocks throughout the world. Although the exact position of continents surrounding Laurentia at that time is uncertain, it is generally accepted that North America was at the centre of a late Precambrian Pangea. A sequence of Precambrian events in Singbhum craton, deformational history of North Singbhum mobile belt and kinematic history of Singbhum shear zone provided an overview of cratonic geology. The ecoregion, composed mainly of massive Precambrian granites and gneisses, takes the form of a rolling, glacial drift-covered, old erosion surface that lies at about 400-600 m asl. In Geirangerfjord these are Precambrian gneisses of the West Gneiss Region, an outstanding example of deeply subducted continental crust and of well preserved high-pressure rocks. Matthew described them as Archaeozoon acadiense, the first Precambrian stromatolite properly identified in the scientific literature. Northeast of the Deh Cho, eastwards and northwards of the interior plains, the hydrological regime is influenced by the open-tundra and taiga vegetation on the glacially-scoured Precambrian shield. I live in Manitoba where there is now the bright idea that spent nuclear rods will be stored in a deep underground storage plant in and around the eastern part of the province, in the deep granite of the Precambrian Shield. In 1953 Stanley Tyler, a geologist from the University of Wisconsin, prepared a thin-section of a jet black rock he had picked up at Schreiber, Ontario and discovered the first diverse Precambrian microbiota anywhere. The Precambrian auriferous Tarkwa conglomerates of Ghana were developed in a modern way during the period 1876-1882 by Pierre Bonnat, the father of modern gold mining in the Gold Coast. He never lost the perseverance, the pioneering spirit, the common touch, nor the free and easy manners he acquired while growing up on the fringes of the Precambrian wilderness. The Quaternary glaciogenic sediments are composed of, among other things, various weathered Precambrian granitoids from Norway and Sweden. These were the pillow lavas of the Precambrian, the ancient bedrock which underlies this south western corner of Anglesey. Its gnarled highlands were once mountains themselves, and there are still some towering peaks of Precambrian rock in Labrador, New Quebec, and Baffin Island. With the older and more resistant rocks of the Precambrian peneplain, these form a low, picturesque coastline of sandy bays and rocky promontories. Show More Sentences Surrounding the basin on all of its sides, except in the east, is the dissected Precambrian peneplain, which rises to elevations of 500 to 1,000 feet above sea level and contains several distinct ranges as high as 2,000 feet. The ecoregion ranges from sea level to about 250 m asl in elevation and is composed predominantly of a mixture of late Precambrian and Palaeozoic sedimentary rocks and granites. Origin and evolution of Precambrian high-grade gneiss terranes, with special emphasis on the Limpopo complex of Southern Africa. Thousands of lakes in Canada, however, lie on the Precambrian Shield. This vast expanse of bedrock possesses few limestone-type materials and, consequently, has only a limited ability to neutralize acidic deposition. For example, in Canada, the Cigar Lake uranium ore deposit has been used as a natural analogue for the long term stability of a spent nuclear fuel repository that could be constructed deep in the Precambrian Shield. The purple-pink-tinged Precambrian sandstone comprising the bulk of Liathach was laid down as long ago as 1,000m years, before multicellular organisms had evolved, and has preserved only plankton-like nannofossils. This part of Scotland largely comprises ancient rocks from the Cambrian and Precambrian, which were uplifted during the later Caledonian Orogeny. Shropshire has a huge range of different types of rocks, stretching from the Precambrian until the Holocene. Centrally, Precambrian, Cambrian, Ordovician, Carboniferous and Permian predominate. The Rocky Mountains expose igneous and metamorphic rock both from the Precambrian and from the Phanerozoic eon. The oldest rocks of Scotland are the Lewisian gneisses, which were formed in the Precambrian period, up to 3 billion years ago. During the Precambrian, the Torridonian sandstones and the Moine were also laid down. These Precambrian rocks are schists and phyllites, often much contorted and disturbed. These are amongst the oldest rocks in Europe, having been formed in the Precambrian period up to three billion years ago. Evidence of the details of plate motions and other tectonic activity in the Precambrian has been poorly preserved. On Earth, gold is found in ores in rock formed from the Precambrian time onward. Our picture of Precambrian marine diversity is dominated by small fossils known as acritarchs. The Baltic Shield is defined as the exposed Precambrian northwest segment of the East European Craton. Areas of Caledonian deformation, which also include the Precambrian gneisses of western Norway. The basement rock of most of Africa was formed during the Precambrian period, and is much older than the Atlas Mountains lying on the continent. Show More Sentences Sedimentary sequences show carbonate platforms as old as the Precambrian, when they were formed by stromatolitic sequences. Most of these Precambrian fossils are microscopic bacteria or microfossils. The Hadean, Archean and Proterozoic eons were as a whole formerly called the Precambrian. Stromatolites are the predominant features of carbonate rocks formed in Precambrian oceans. Wrangel Island consists of folded, faulted, and metamorphosed volcanic, intrusive, and sedimentary rocks ranging in age from Upper Precambrian to Lower Mesozoic. The Berkshires in Massachusetts and Connecticut, and the Green Mountains in Vermont, as well as the Taconic Mountains, form a spine of Precambrian rock. Other durable but pliable organic materials, such as protist resting cysts, are important parts of the Precambrian fossil record, up to 2 billion years old. In this context, the Precambrian rocks of the Canadian Shield, known for their numerous metal and diamond deposits, offer favourable prospects for future mineral exploration. Most Precambrian chert is abiogenic, whereas silica-secreting organisms have controlled the accumulation of most cherrty deposits since the Cambrian. Lichenized Glomeromycota may extend well back into the Precambrian. My overall objective is to develop and refine new ways of extracting information from remarkably preserved Precambrian organic material and the minerals that host it. Stratigraphical palynology is a branch of micropalaeontology and paleobotany, which studies fossil palynomorphs from the Precambrian to the Holocene. In general, the fossil record shows a very slow appearance of these lifeforms in the Precambrian, with many cyanobacterial species making up much of the underlying sediment. The geological substrate of the caatinga is severely eroded crystalline bedrock of the Precambrian Brazilian Shield and Paleozoic and Mesozoic sedimentary basins. These geochemical and microfossil findings support the idea that during the Precambrian period, complex life evolved both in the oceans and on land. However, evidence of Precambrian Metazoa is gradually accumulating. These indicate that two other periods of widespread glaciation occurred during the late Precambrian, producing the Snowball Earth during the Cryogenian Period. Some geologists have argued that Hudson Bay is possibly related to a Precambrian extraterrestrial impact and have compared it to Mare Crisium on the Moon. This part of Scotland is largely composed of ancient rocks from the Cambrian and Precambrian periods which were uplifted during the later Caledonian Orogeny. In the southwest, Precambrian quartzites were formed from very ancient sea sediments and form strikingly sharp ridges and ranges, such as Federation Peak or Frenchmans Cap. Show More Sentences The Lewisian complex or Lewisian gneiss is a suite of Precambrian metamorphic rocks that outcrop in the northwestern part of Scotland, forming part of the Hebridean Terrane. The Hebrides have a diverse geology ranging in age from Precambrian strata that are amongst the oldest rocks in Europe to Paleogene igneous intrusions. The Dalradian Supergroup consists of metasedimentary rocks which underwent polyphase deformation and metamorphism during the Precambrian and early Paleozoic. If a single mammalian fossil were found in situ in precambrian rock strata, evolution would be falsified. The lithology in all studied areas comprises precambrian schist, with similar geomorphologic characteristics. Examples from Classical Literature We may take our own country as a region where a good development of the Precambrian rocks occurs. A few explanatory remarks concerning the mode of detection of Precambrian rocks may not be amiss. These Torridonian strata furnish us with the most satisfactory group of Precambrian sediments yet detected in Britain. Find more words! 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Words that rhyme with Precambrian Use our Sentence Generator Nearby Words precalculus prebudget Preble pre-birth prebiotic prebendary Pre-Cambrian precancerous pre-cancerous precapitalist precarious precariously