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Calcareous soils are relatively alkaline, in other words they have a high pH.They are characterized by the presence of calcium carbonate in the parent material; the carbonate-ion is a base.
Acarospora stapfiana typically grows on calcareous rocks, but is also found on sandstone, granitic, and volcanic rocks. [3] It is parasitic on species of the genus Caloplaca (in the broad sense; the genus Caloplaca has been split into many smaller genera), particularly saxicolous (rock-dwelling) species. It has been recorded in various regions ...
Kurkar is the regional name for an aeolian quartz sandstone with carbonate cement, [3] in other words an eolianite or a calcarenite (calcareous sandstone or grainstone), found on the Levantine coast of the Mediterranean Sea in Turkey, [3] Syria, Lebanon, Israel, [4] the Gaza Strip [5] and northern Sinai Peninsula. [6]
Calcareous speleothems form via carbonate dissolution reactions whereby rainwater reacts with soil CO 2 to create weakly acidic water via the reaction: [3] H 2 O + CO 2 → H 2 CO 3 As the acidic water travels through the calcium carbonate bedrock from the surface to the cave ceiling, it dissolves the bedrock via the reaction:
Predominantly distributed in the southwestern part of North America, Tomnashia is found mainly on calcareous rock and soil, but it can also grow on non-calcareous rocks. . Some related genera, such as Polycauliona and Igneoplaca, share a similar, relatively limited distribution in coastal southwestern North Ame
Among the rock-dwelling species, there are both epiliths (those that grow on the surface) and endoliths (those that grow "within" the rocks, i.e., under and around the rock crystals). Calcareous rocks are the most common substrate for the rock-dwellers, but some, especially those in aquatic or semi-aquatic habitats, grow on siliceous rocks. [6]
Also called Indianite. A mineral from the lime-rich end of the plagioclase group of minerals. Anorthites are usually silicates of calcium and aluminium occurring in some basic igneous rocks, typically those produced by the contact metamorphism of impure calcareous sediments. anticline An arched fold in which the layers usually dip away from the fold axis. Contrast syncline. aphanic Having the ...
Soil components larger than 2.0 mm (0.079 in) are classed as rock and gravel and are removed before determining the percentages of the remaining components and the textural class of the soil, but are included in the name. For example, a sandy loam soil with 20% gravel would be called gravelly sandy loam.