silcrete वाक्य
उदाहरण वाक्य
मोबाइल
- Evidence was found that raw silcrete blanks and blocks were transported prior to heat treating during the MSA . The geochemical signatures of the fragments can be used to identify where many of the individual pieces were quarried.
- This occurred at deeper levels, at the intersection with the groundwater table ( forming " groundwater silcrete " ), or close to the surface, within the soil profile ( forming " pedogenic silcrete " ).
- This occurred at deeper levels, at the intersection with the groundwater table ( forming " groundwater silcrete " ), or close to the surface, within the soil profile ( forming " pedogenic silcrete " ).
- In places where fluvial erosion has been more active, gullies have dissected the palaeosurface of the upland, forming a characteristic tableland topography where a continuing process of scarp retreat leaves behind mesas and buttes, which persist until their residual silcrete capping is finally lost.
- In Australia, silcrete was widely used by Aboriginal people for stone tool manufacture, and as such, it was a tradeable commodity, and silcrete tools can be found in areas that have no silcrete groundmass at all, similar to the European use of flint.
- In Australia, silcrete was widely used by Aboriginal people for stone tool manufacture, and as such, it was a tradeable commodity, and silcrete tools can be found in areas that have no silcrete groundmass at all, similar to the European use of flint.
- In Australia, silcrete was widely used by Aboriginal people for stone tool manufacture, and as such, it was a tradeable commodity, and silcrete tools can be found in areas that have no silcrete groundmass at all, similar to the European use of flint.
- The technique was used during the final shaping of Still Bay bifacial points made on heat treated silcrete . " Both pressure flaking and heat treatment of materials was previously thought to have occurred much later in prehistory, and both indicate a behaviourally modern sophistication in the use of natural materials.
- :They may be formed in the Danian, but the Sarsens are apparently an example of silcrete, a superficial deposit resulting from weathering, so even if you could find the base of this, it wouldn't be a stratigraphic contact . talk ) 18 : 54, 24 February 2011 ( UTC)
- Over long periods of time, as the landscape was lowered further by weathering and erosion, the silcrete became exposed at the surface as a lag gravel, an armoured carapace of " gibbers " ( also known as a " desert pavement " ), protecting the weaker regolith below from mechanical erosion.
- 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.
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