How to use chert in a sentence

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Sentence Examples Clovis and Folsom points from these two nearby bison kills are predominantly of Edwards chert. Asymmetrical folds and axial planar quartz veins, isoclinal and rootless folds and boudinage of chert layers are common. Hopewellian chert tool industries consist of three discrete manufacturing trajectories, resulting in tools made on cores, flakes, and blades. The vast majority of chert tools found at Hopewell sites are not made from blades, but from reduction flakes derived from multidirectional cores. Shale adjacent to ironstone is ferruginized, strongly foliated and complexly folded where it contains chert layers. Geologically the axes from the New Guinea Highlands comprise thermally metamorphosed basalt, chert and greywacke depending on quarry source. Larger village sites have yielded a much wider range of chert tools than have smaller encampments. The fine preservation is due to the silicification of chert in which it was embedded. In fact, seventeen of the fifty-seven sites are specifically listed for agate, chalcedony, chert, jasper, or petrified wood. Subsequently the massive sulfide deposit and surrounding metalliferous sediment apron were covered by oceanic radiolarian chert sediments. The sedimentary lenses are composed of limestone, sandstone, siltstone, mudstone, shale, chert and well-bedded calci-turbidite. Lead ore, pig lead, timber and chert stones from Flintshire were the other significant cargoes. The conchoidal fracture exhibited by chert and obsidian allows them to be shaped into sharp points and edges. Large chert concretions appear 8 m above the base of the unit at Muller Canyon whereas at Reno Draw they do not appear until 18 m above the base. The Haluut Bulag melange contains lenses of limestone, sandstone, chert, tuff, minor acid volcanic material, and vesicular basalt. The sequence includes tuffaceous sandstone, andesitic sandstone and radiolarian chert. The volcano-sedimentary sequence is characterized by lava flows alternating with grey shales and occasional red chert bands. Quarzitic gneiss, low-grade metamorphic basic rocks, phyllites and dark chert can be abundant in some layers. Cuboid cores are prepared blocky-like cubes of chert, with blades often produced on six sides. Upland soils are highly weathered alfisols and ultisols, with large clay fractions and chert intermixed throughout the profile. Show More Sentences Both the sandstone and andesite show strong quartz and chert veining and carry disseminated pyrite. Crystals of brown sphalerite are found in fractures and on the surfaces of some chert nodules. Indeed, when hafted lithic tools were broken or became worn out, trips to flint or chert sources would have been necessary. In some shale horizons, layers of laminated chert occur along anastomosing foliation planes that are subparallel to bedding. Trace elements and oxygen isotopes are useful geochemical indicators of the chemistry of the waters from which the chert precipitated. He could see that they occurred within the chert and, therefore, they could not be modern contaminants. But the fossil record from the greater than 1300 million years intervening between these deposits and the Apex chert is essentially undeciphered. Chert layers and nodules are relatively abundant and it is striking that many limestone beds display, in their middle part, a 2-8 cm thick, irregularly bedded chert layer. The upper portion of the sedimentary unit is brecciated and has pyritic chert and graphite horizons. Finally, on Lac Bienville, chips of Nastapoka chert have been found in association with Ramah quartzite and some polished objects. Numerous other sources of chert and crystalline quartz have been found in the region. In prehistoric quarries, chert was mined with tools made of wood, bone and antlers. The volcanics occur from 454.6 to 455.4 meters is marked by a chert horizon with graphite and massive pyrite. In the area of Saglek Fjord and Ramah Bay there is a unique stone called Ramah chert. Aboriginals of more recent times used the ecodistrict to hunt for game and perhaps to quarry for chert and slate. While some of the inland sites are characterized by a predominance of quartz, there are others that contain Nastapoka chert. Its burial sites often contain rich artifacts, including many triangular chert blades, carefully cut uniquely for placement at burial sites. The chert found at this site is associated with the east coast of Hudson Bay. The third site, HaGe-21, appears to have been a chert acquisition site and a habitation site. Fracturing, mineralization and replacement by chert and sulphides took place parallel to the shear-zone walls, resulting in the formation of ironstones. Show More Sentences In particular, the research team is interested in the temporal span of mining activity in the cave and identification of chert testing locations and artifact palimpsests. The artifacts recovered from these excavations will give a clearer picture of the technology and particularly their production and use of flint and chert. Fieldwalking revealed a wide range of lithic materials used for cutting tools, including local gravel, Pennine chert and flint from the Wolds and coast. The Haight Creek is primarily composed of dolomitic mudstones and wackestones with abundant chert interbeds and thin, discontinuous crinoidal packstones. Where limestone occurs adjacent to ironstone, it shows various stages of replacement by chert and hematitic material parallel to bedding and along fractures. Other materials present in smaller amounts, such as the Ozarkian chert and the clinker abrader, also have eastern origins but could have been obtained in trade. Slices incorporate oceanic pelagic and hemipelagic lithologies such as chert, siliceous, calcareous and tuffaceous mudstone, limestone, and siliceous and calcareous shale. Sometimes, a sharp tool such as a chert flake was used, while other times blunt instruments such as torch canes or the artist's fingers were employed. Silica precipitated from aqueous solution at low temperatures gives cryptocrystalline varieties such as opal, jasper, chalcedony, agate, carnelian, onyx, flint, and chert. Quartz and sphalerite occur in vugs and veins in the chert nodules. Conglomerate clasts are principally volcanic rocks and greenish gray chert, with subordinate arkose, graywacke, siltstone, red chert, quartzite, white quartz, and limestone. Two major varieties of chert deposits exist namely, bedded chert and nodular chert. Nevertheless, many tectonic ironstones are rather massive, cherty rocks, suggesting that early structural fabrics were annihilated by late-stage chert replacement. Later chert is light coloured, follows the bedding, and is usually fossiliferous. The origin of this chert is somewhat uncertain, but it appears to reflect either primary or secondary origin. Bedded chert is sometimes associated with these basinal shales, as in China. Jasper, opaque, fine-grained or dense variety of the silica mineral chert that exhibits various colours. Ventifacts are produced under arid conditions and are generally formed from hard, fine-grained rocks such as obsidian, chert, or quartzite. Y et, trade in copper and silver and the use of chert implements were extensive in North America for over 50 00 years before European settlement. Today, millions of chert fragments from these early mines can still be observed. Show More Sentences Early hunters prized chert for its hardness and flaking qualities, which allowed the stone to be easily worked. Bedrock exposed on Vedder Mountain and east of Cultus Lake is made up of thinly layered, dark argillite, and lesser phyllite, gneiss, limestone, and chert. They speak to us of the Lower Galician. They speak to us of the Plasticine, the overburden, the underburden, the chert concretions, the Great Ice age. The anomalous intercepts are in the upper-plate of the Roberts Mountains Thrust which dominantly consists of argillite, siltstone, and chert. Ramah chert was made into such items as arrowheads and tools. Because limestone is comparatively less dense than adjacent oceanic rocks, such as basalt or chert, many of the Permian reef limestones were not as readily subducted. The ores comprising blue and red hematite with goethite and limonite were formed by the leaching of the gangue minerals such as chert, silicates and carbonates. Evidence of secondary origin includes relict structures of allochems such as skeletal fragments and oöids preserved entirely within chert nodules. There is a succession of hills and valleys with lower slopes of nacreous limestone, on the slopes there is limestone with chert and on the hilltops clay and hard limestone. The Chimney Hill is comprised of basal oolites grading upward into fractured chert and dolomite. At some localities, the lower part of the formation contains stromatolites up a metre across and, where these stromatolites are preserved in jasper, the chert can be polished to a stunningly beautiful red rock. Jasperization of chert was concomitant with hard ore formation, but it was incidental rather than necessary for ore localization. Dolomitic and chert ooids are most likely the result of the replacement of the original texture in limestone. In addition to his red, iron-rich specimens, Tyler collected some jet black chert samples from the Gunflint exposed at Kakabeka Falls and on the north shore of Lake Superior near the small town of Schreiber. This new discovery lies west of old drillhole W85-14, which intersected large zones of chert and massive sulphides enriched in silver, zinc and lead. Quartz and chert veins with Cu-sulphides and selenides. It contains fragments of volcanics, 0.5 to more than 6.0 centimeters in size, consisting of felsic to mafic volcanics, as well as chert blocks, in a wacke type matrix. Most Precambrian chert is abiogenic, whereas silica-secreting organisms have controlled the accumulation of most cherrty deposits since the Cambrian. Flint, chert, and obsidian all served utilitarian purposes in Maya culture, but many pieces were finely crafted into forms that were never intended to be used as tools. Thinly bedded pea gravel consisting of black chert and metaquartzite clasts are commonly associated with indurated sandstones and orthoquartzites. Show More Sentences It is represented by a phosphate-dolostone sequence in Wengan, where it is 33 to 55 m thick and consists mainly of dark phosphate, cherty phosphate, chert, and gray dolomite. In carbonate based rocks such as limestone or chalk, chert or flint concretions are common, while terrestrial sandstones can have iron concretions. The oldest fossil lichens in which both symbiotic partners have been recovered date to the Early Devonian Rhynie chert, about 400 million years old. Thus when archaeologists come upon objects of obsidian or chert, copper or gold, they have almost unparalleled opportunities to interpret ancient pathways of trade. Examples from Classical Literature In the same limestone there are enormous beds of chert, agates, and carnelians. Limestones lose their calcium carbonate by solution, leaving only clay with fragments of quartz or chert as impurities. The chert has sometimes the appearance of calcedony, and is finely striped. The hornstone which occurs in secondary limestone is called chert by the English miners. As seen on a polished slab of chert from the sand of the Upper Oolite, Tisbury. Billy had showed David how to knap flint and chert the week before, after seeing a filmstrip about it in class. Seven specimens were of basalt and one each of chert and porphyry. Find more words! 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Words that rhyme with chert What is the plural of chert? What is the adjective for chert? What is the noun for chert? Use our Sentence Generator Nearby Words chersonese cherrywood cherrystone cherry-picking cherry-picker cherry-picked Chertsey cherub cherubic cherubically cherubim Cherubim 5-letter Words Starting With c ch che cher