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  • noun

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variety of silica containing microcrystalline quartz

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The researchers studied volcanic rock and a kind of silica called chert that formed deep underwater.
Component 1 displays fairly even counts of bifaces and flake tools (Table 5), with a heavy emphasis on cherts and chalcedonies in the debitage and an even greater emphasis on chalcedony used for formal tools (Table 6).
The basal horizon consists of iron stained, poorly sorted chert gravel with small rounded pebbles of quartzite and fine- to coarse-grained quartz sands that grade upward into quartz sand that, in turn, grades upward into yellowish-orange, sandy silts and clays, a typical meandering stream deposit.
The New Harmony Group is present only in the subsurface of southwestern Indiana, contains in ascending order the Grassy Knob Chert, The Backbone Limestone, and the Clear Creek Chert, and ranges in thickness from zero at its eroded limit to almost 900 feet (820 m).
Fine, doubly terminated, deep reddish brown crystals of brookite have been discovered in a chert vein cutting across Hale Creek, Trinity County, California.
Hydrogen and oxygen isotope ratios in nodular and bedded cherts.
The results of our analyses demonstrate that the lithic raw material available at Vihtr'ii Tshik is best characterized as chert, and that 86% of the flakes and tools from Kuukpak analyzed in this study are chemically similar to the raw material from Vihtr'ii Tshik.
For their study of the Permian, the Canadian team collected a section of well-preserved shales and cherts from northeastern British Columbia.
20 m thick exhalite zone consisting of cherts, silica sinter and a 1.
Assemblages comprise quartz crystal, red and white quartzites, and some Ramah and dark grey cherts.
East of this fault, Chilitos breccia and altered sediments and cherts are exposed along a road cut.
All of the analyzed lithic artifacts from the Red Dog sites are produced from fine-grained, cryptocrystalline cherts (see Mull et al.
The staking covers the 3,000-meter trace of a regional fault cutting cherts and siltstones of Ordovician age.
The bedrock from the first hole consisting of cherts and siliceous volcanics with minor carbonates.
The property contains a series of andesites and pyroclastics and cherts mineralized with gold and copper.