Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun An
indurated duricrust formed whensilica isdissolved andresolidifies as acement .
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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They are underlain predominantly by Cape shales, and form an undulating plain 150 m to 400 m above sea level with occasional silcrete - and ferricrete-capped hills, remnants of a Tertiary land surface.
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Fynbos/Renosterveld Mosaic comprises a mosaic of fynbos and renosterveld communities associated largely with shale-derived soils, especially where silcrete/ferricrete material is present in the profile or occur as remnant outcrops.
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Much of the region is occupied by sand dunes, with areas of calcrete and silcrete.
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The removal of flakes from unheated silcrete produces scar surfaces with a rough, dull texture.
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Africa during the Middle Stone Age by anatomically modern humans and involved the heating of silcrete -- quartz grains cemented by silica -- used to make tools, the university said in a news release.
Reuters: Top News 2010
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Pitting and trenching work exposed a thick, pervasive overburden generally comprising fine grained red brown to orange brown silt sand at the top, followed by gravelly silt and ferricrete intercalated with silcrete.
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They found that unheated chunks could not be pressure flaked, while blocks of heated silcrete yielded points very much like the ones discovered.
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The stone points were made of silcrete, or quartz grains cemented by silica, which needs to be heat-treated before pressure flaking.
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Blombos Cave involved pressure flaking with heat-treated silcrete.
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However, the surfaces of silcrete that was treated with heat have a smooth, glossy appearance.
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