silcrete


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silcrete

[′sil‚krēt]
(geology)
A conglomerate of sand and gravel cemented by silica.
References in periodicals archive ?
2007, Optically continuous silcrete quartz cements of the St.
This was a time period when the energy from floodwaters was very high; large cobbles were pushed across the landscape during flood events and it appears early assemblages of flaked silcrete artefacts were polished and sub-rounded to then lie exposed for millennia in brachiating creeklines fringing the lake.
7 Nature by archaeologist Kyle Brown of the University of Cape Town in South Africa and his colleagues--were made from a type of stone called silcrete that had first been heated to make the rock easier to chip.
From this work, Toro has identified up to seven sand units above the basement and below a confining upper silcrete unit.
Silcrete plant fossils from Lightning Ridge, New South Wales: new evidence for climate change and monsoon elements in the Australian Cenozoic.
Ochre chips were crushed with quartz, quartzite and silcrete hammerstones/grinders and combined with heated crushed, mammal-bone, charcoal, stone chips and a liquid, which was then introduced to the abalone shells and gently stirred.
Additionally, fossiliferous (non-marine bivalves and plants) Eocene sediments are extant as silcrete caps on interfluves (Wilde and Backhouse 1978); these are located at elevations 310-320m a.
The original work was undertaken at surface depths of approximately 30 centimetres and failed to penetrate the silcrete layer, impeding the geochemical imprint of the calcrete zone, which is an indicator of deeper geology.
Wider, more irregular grooves characterize 36 pressure-flaked Blombos tools, which were made from silcrete, Villa says.
Vincent Mourre and colleagues from France and South Africa analyzed some silcrete stone points from Blombos Cave that were probably tied to spears and used as hunting weapons.
Most early sites contain abundant flakes in other materials: porcellanite, silcrete and flint.