A breccia or conglomerate cemented together by calcareous material, formed in soils in semi-arid conditions.
〔地质〕钙质结砾岩。亦称CALICHE
Also called caliche
Example sentencesExamples
The stacked and generally well-developed nature of the calcrete profiles, by comparison with Quaternary calcretes indicate that the more and phases persisted for hundreds of thousands of years.
In more arid areas calcrete (consisting of calcium carbonate) is the duricrust.
The Yellow Cat Member contains a basal calcrete with interbedded sands and clays and extends upward to a prominent sandstone unit.
The region's Mediterranean style climate and annual water deficit has led to extensive calcrete development.
Brown, grey and yellow siltstone with abundant calcrete nodules and rare small gypsum crystals occurs intercalated with lenticular units of matrix-supported pebbly conglomerate.
The formation is composed of red siltstones, containing discontinuous calcrete horizons, channelized sandstones and thin beds of current-rippled fine sandstone.
The bottom of the rock has a layer of calcrete that tells us it was at one time exposed to air and it shows the transition between being exposed and becoming submerged.
In a wash below the homesteads is a tool making site; discarded flints of granite, quartz and calcrete ornament the bare sandy soil.
This calcrete can be three meters thick and looks like a breccia.
Thin coals mark periods of swamp conditions on the floodplain, although some palaeosol profiles suggest relatively well-drained conditions, including a thin calcrete.
Although calcrete nodules occur immediately below this fossil forest, the trees are rooted in a thin hydromorphic layer superimposed on top of the underlying well-drained soils.
Origin
Early 20th century: from calc- + a shortened form of concrete.