chert


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Related to chert: Dolostone, micrite
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  • noun

Words related to chert

variety of silica containing microcrystalline quartz

References in periodicals archive ?
According to the researchers, haematite crystals in the Marble Bar Chert formed in water at least 200 meters deep, because microscopic analysis of the rocks show no sign of wave action or other structures characteristic of shallow-water sediments.
Raw material conservation is evidenced in the use of fossiliferous chert at Tunnel Cave at the time sea-level started to rise (17,000-16,000 BP).
The name New Harmony Group was proposed by Becker & Droste (1978) to include the Grassy Knob Chert, Backbone Limestone, and Clear Creek Chert (Fig.
Petrofacies (P1): se define por un alto contenido de plagioclasa, feldespato potasico liticos metamorficos (filitas micaceas y grafitosas) y sedimentarios (lodolitas y lodolitas oxidadas) entre 4,1%-14,7%, presencia de cuarzo policristalino foliado, liticos volcanicos, intraclastos calcareos, chert y glauconita.
Ond y llun i mi yw Harri Bach Bodedern, gyda'i goes bren a'i ffon fagl, yntau gydag asyn a chert yn y stryd.
The predominant stone raw materials are chert (94%, n=279), limestone and greywacke.
2] into layers of sandstone, limestone, dolomite, or chert, or injecting it deep into underground aquifers, where it will theoretically remain in solution for thousands of years.
PETROGRAPHY AND PETROCHEMISTRY OF LOWERMOST MIDDLE ORDOVICIAN CHERT IN THE VICINITY OF CHATTANOOGA, TENNESSEE.
Prehistoric folk went there to dig up pieces of chert, a flint-like rock that they fashioned into stone tools.
There would be many more prehistoric sites in the "Unknown Affiliation" category (Table 1) were it not for the diagnostic links of a side-notched endblade with Groswater groups, for example, or the strong association of Ramah chert with Late Prehistoric Indian groups.
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The researchers studied volcanic rock and a kind of silica called chert that formed deep underwater.
6f) is a bi-marginally retouched tool on a thin gray chert flake, semi-circular and crescentic in outline.
La composicion de los clastos es de chert, areniscas, vulcanitas, calizas y esporadicas plutonitas de composicion dioritoide, con escazas intercalaciones de areniscas conglomeraticas de composicion litoarenitas en capas gruesas.