Anagram & Information om | Engelska ordet SILCRETE

Exempel på hur man kan använda SILCRETE i en mening

• Sarsen stones are the post-glacial remains of a cap of Cenozoic silcrete that once covered much of southern England.
• Researchers have concluded that Stillbay people prepared the silcrete stone out of which they made their stone tools with preheating in human made fire to increase its workability.
• Fire was used for heat treatment of silcrete stones to increase their workability before they were knapped into tools by Stillbay culture in South Africa.
• Evidence also exists for the systematic heat treating of silcrete stone to increase its flake-ability for the purpose of toolmaking, beginning approximately 164,000 years ago at the South African site of Pinnacle Point and becoming common there for the creation of microlithic tools at about 72,000 years ago.
• Within the Howiesons Poort layers, however, there is considerably more raw material diversity through the additions of quartz, silcrete, hornfels and chalcedony.
• The prolonged chemical weathering also dissolved silica which, transported through the regolith by the movement of groundwater, precipitated as the ambient conditions changed, forming silcrete (a type of duricrust), with the silica forming a secondary cement binding the sediment grains into sheets of hard, indurated rock, generally parallel to the land surface.
• Elsewhere, beekite has been compared to silcrete, indicating a break in sedimentation, where it occurs as encrustations on clasts of carbonate rock in the Palaeocene alluvial fan deposits of central Anatolia.
• It is endemic to the Overberg region of the Western Cape Province, South Africa, where it occurs on silcrete, but also in flat, coastal sandy or clay Renosterveld vegetation, between the towns of Bredasdorp and Mossel Bay.

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