calcrete造句

• Subsequent wind erosion of the aeolianite then exposed the calcrete pillars.
• These sequences include paleosols, calcrete and dolocrete.
• This calcium accumulates at high concentrations around the roots and over time is converted into a calcrete.
• Often thick, magnesite-calcrete caprock, laterite and duricrust forms over ultramafic rocks in tropical and subtropical environments.
• Previously the calcrete zone " often quarried for limestone " was considered as the boundary between the Silurian and Devonian.
• These inorganically formed calcrete limestones were formerly known as the Psammosteus Limestones but now known as the Bishops Frome Limestone.
• The river trickles over a waterfall into a narrow gorge through bright reddish-pink sandstone and yellow calcrete formations.
• Regolith may host many mineral deposits, for example mineral sands, calcrete uranium, and lateritic nickel deposits, among others.
• Often found among calcrete outcrops it has a scattered distribution throughout the Gascoyne region of Western Australia where it grows in clay loam soils.
• Instead, these hills consist of alternating layers of loess and calcrete that are more or less concordant with the modern surface of these hills.
• Internally, they lack any evidence of cross-bedding or erosion of interbedded layers of loess and calcrete that characterize dunes formed by moving currents.
• In the east of the basin, the top of the Raglan Mudstone is marked by a well-developed calcrete, the Bishop's Frome Limestone.
• Stygofauna can live within freshwater aquifers and within the pore spaces of limestone, calcrete or laterite, whilst larger animals can be found in cave waters and wells.
• The Kimba district is dominated by calcareous earths, containing distinctive calcrete profiles and varying degrees of development, with minor ferruginous red-brown earths and local pisolitic regions.
• Charles Dortch has identified chert and calcrete flake stone tools, found at Rottnest Island in Western Australia, as possibly dating to at least 50, 000 years ago.
• The landforms of the area are primarily composed of wide calcrete plains, often covered by Pleistocene Age aeolian deposits of sand dunes, sometimes reworked into ephemeral sheetwash fans.
• Finally, the calcrete horzons are paleosols that represent the periodic cessation of loess accumulation for periods of thousands of years during which they formed within the surface of a loess layer.
• One of the world's largest deposits of calcrete is in the Makgadikgadi Pans in Botswana, where surface calcretes occur at the location of a now-desiccated prehistoric lake.
• It forms sheets across alluvial plains and can occur as discontinuous lines of nodular kankar or as indurated layers in stratigraphic profiles more commonly referred to as calcrete, hardpan or duricrust.
• Kinclaven occupies an area of and is mostly composed of deflated limestone plains with regular karst depressions surrounded by bindii grasslands along with areas of calcrete plains covered with myall woodlands and mixed shrubland.