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Related to chert: Dolostone, micrite
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The above regional decription fits well with the geology in the Shepherds Bush area, where iron and manganiferous sediments and associated cherts extend for ~6 kilometres north through the Spotted Dog gold resource area.
The lithic assemblage is composed of chert and quartz flakes, and a range of tools such as hammerstones, projectile points, bifaces, and scrapers of Temiscouata chert.
And then, it finally hit me: If I could use a chert point found on our ranch to ignite a flintlock rifle load and kill a deer on the same land, I could blend 4,000 years of hunting into one event.
Most of the concretions occurred at low angle or parallel to the depositional plane, embedded in the surrounding black shales or green chert (Figures 1(b) and 1(c)).
Finally, eight samples composed of chert from the quarry in Triadi of Thessaloniki (Central Macedonia, Greece) were selected for isotopic, chemical, and mineralogical analyses.
Caption: Billions of years ago, localized hydrothermal activity, not globally warm oceans, heated and altered this South African chert (rocks in the foreground) that formed on the seafloor.
Any stone with a white colour, such as chert, could be described as garradin no-dewhma.
7d) is on a cortical spall of dark gray chert, exhibiting patches of stream-rolled cobble cortex and steep use wear on both margins, terminating in step fractures along natural fracture planes in the dorsal cortex.
Belqa Group was firstly named by Quennell (1951) and was divided into five formations of predominantly limestones and chalks showing partly high amounts of chert and phosphate; Wadi Umm Ghudran Formation which is considered as an aquitard, it is composed of white chalk, chert, and microcrystalline limestone concretions with phosphatic chert, with an average thickness of about 20 m (Mc Donalds, 1965).
Patent 8,232,348 (July 31, 2012), "Masterbatch and Polymer Composition," Chert Changping (Biograde (Hong Kong) Pty Ltd., Hong Kong, China).