Anagram & Information om | Engelska ordet CHERT

Exempel på hur man kan använda CHERT i en mening

• A microlith is a small stone tool usually made of flint or chert and typically a centimetre or so in length and half a centimetre wide.
• Flint, occasionally flintstone, is a sedimentary cryptocrystalline form of the mineral quartz, categorized as the variety of chert that occurs in chalk or marly limestone.
• Banded iron formations (BIFs; also called banded ironstone formations) are distinctive units of sedimentary rock consisting of alternating layers of iron oxides and iron-poor chert.
• As early as 9,000 BCE, Native Americans came to Montana City to collect chert, a rock similar to flint, which was used to make spear tips, arrowheads, and knives.
• Cryptocrystalline tool stones include flint and chert, which are fine-grained sedimentary materials; rhyolite and felsite, which are igneous flowstones; and obsidian, a form of natural glass created by igneous processes.
• The most famous and most prevalent prismatic blade material is obsidian, as obsidian use was widespread in Mesoamerica, though chert, flint, and chalcedony blades are not uncommon.
• Knapping is the shaping of flint, chert, obsidian, or other conchoidal fracturing stone through the process of lithic reduction to manufacture stone tools, strikers for flintlock firearms, or to produce flat-faced stones for building or facing walls, and flushwork decoration.
• In pre-colonial times, Indigenous people of the Onguiaahra (Neutral Iroquois) lived in the area, due in part to the ready availability of flint and chert from outcroppings on the Onondaga Escarpment.
• In 1999 Charles Dortch identified chert and calcrete flake stone tools, found at Rottnest Island, as possibly dating to at least 50,000 years ago.
• It also refers to development as the result of weathering of a case-hardened layer, called cortex by geologists, within the surface of either a flint or chert nodule.
• Materials that break in this way include quartz, chert, flint, quartzite, jasper, and other fine-grained or amorphous materials with a composition of pure silica, such as obsidian and window glass, as well as a few metals, such as solid gallium.
• Following the volcanic activity, a basin formed in the northeast, with deposition in a brackish lake—producing the siltstones and chert of Tung Ping Chau, which have been dated from the early Paleogene period.
• There are locations of interest to geologists: an argillite outcrop in Ōmiha, and a chert stack at the end of Pohutukawa Point, considered "one of the best exposures of folded chert in Auckland City".
• There is significant evidence of stoneworking, including local pounamu as well as argillite, obsidian, and chert imported from elsewhere in Aotearoa.
• They revealed scrapers, microliths, flakes of chert (hard, sedimentary rock), flints and even rudimentary tools.
• Ooids are most commonly composed of calcium carbonate (calcite or aragonite), but can be composed of phosphate, clays, chert, dolomite or iron minerals, including hematite.
• These carbonate rocks contain variable amounts of chert and are often interbedded with fine grained clastic rocks.
• This variety of chert was of great importance to First Nations peoples throughout Southern Ontario, who used it to make stone tools (lithics) such as projectile points and hide scrapers.
• Located along the slopes and at the top and of a ridge, the site contains 82 boulders with petroglyphs, six mortars, two metates and a scatter of ceramics and chert lithics.
• Built atop bedrock consisting largely of seismic-dampening radiolarian chert, many of the hill's structures had survived the tremor, and the sparseness of the development saved much of Bernal from the ravages of the firestorm that followed.

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