silcrete वाक्य
उदाहरण वाक्य
मोबाइल
- Quartz and quartzite predominate the earliest unit with few occurrences of silcrete.
- Although it is hypothesized that it is groundwater silcrete, its origin remains unresolved.
- Silcrete was widely traded throughout the region.
- During 70-74 ka unit, silcrete has replaced quartz while quartzite is still fairly dominant.
- Aside from quartz and silcrete, the other materials are unknown on how they got to the location.
- The Wilton Industry is primarily characterized by microliths and hafted tools, often made from chalcedony or silcrete.
- Eurobodalla Coast Tourism notes that the Congo area was a major source of silcrete, used to make stone tools.
- Fire was used for heat treatment of silcrete stones to increase their workability before they were knapped into tools by Stillbay culture.
- These landforms are characterized by strongly developed soils that usually have a relatively impermeable layer ( claypan or silcrete duripan ) in the subsoil.
- The original owners quarried local silcrete and basalt to produce tools; hammer stones were used to create sharp blades, axes and other stone tools.
- 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.
- Fine-grained stone such as silcrete and quartz make up a large percentage of Howiesons Poort artifacts than in both earlier and later Middle Stone Age cultures.
- Groundwater silcretes typically formed in more localised, topographically lower settings such as valley bottoms and slopes, whereas pedogenic silcrete tended to form extensive sheets over very large areas.
- In South Africa at Pinnacle Point researchers have determined that two types of silcrete tools were developed between 60, 000 and 80, 000 years ago and used the heat treatment technique.
- 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.
- The evidence includes some combination of carbonized roots and rootlets, rhizoliths, illuvial clay cutans, silcrete-like silica cements, and the leaching and alteration of the sandy sediments by weathering and plants.
- Experiments involved slowly heating silcrete stones to ~ 350 �C . Thermoluminescence confirmed that all stones analysed ( limited to 26 in number due this being a destructive process ) had been heated to this temperature.
- The peoples of the African Middle Stone Age ( MSA ) showed a preference for silcrete tools, sourcing the material from up to 200 km to use in place of more accessible quartz and quartzite.
- It can sometimes be found in dry and rocky watercourses, but is most often found in clusters on rocky jump-ups and colluvial slopes of rocky mesas with weathered silcrete rocks and loamy soils.
- Formation in this are from the Permian : Boniches, Alcotas, an unconformity followed by Hoz de Gallo Conglomerate, this is capped by sandstone and silcrete at another unconformity marking the end of the Permian.
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