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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.
Candelariella species are found across the globe, although most commonly described in North America, Asia, and Australia. Species can be found on calcareous and non-calcareous rock, soil, tree bark, mosses, and other lichens.
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 ...
Pelagic sediment or pelagite is a fine-grained sediment that accumulates as the result of the settling of particles to the floor of the open ocean, far from land. These particles consist primarily of either the microscopic, calcareous or siliceous shells of phytoplankton or zooplankton; clay-size siliciclastic sediment; or some mixture of these.
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: CaCO 3 + H 2 CO ...
The following is a list of rock types recognized by geologists.There is no agreed number of specific types of rock. Any unique combination of chemical composition, mineralogy, grain size, texture, or other distinguishing characteristics can describe a rock type.
Fusulinid from the Plattsmouth Chert, Red Oak, Iowa ().Micropaleontology can be roughly divided into four areas of study on the basis of microfossil composition: (a) calcareous, as in coccoliths and foraminifera, (b) phosphatic, as in the study of some vertebrates, (c) siliceous, as in diatoms and radiolaria, or (d) organic, as in the pollen and spores studied in palynology.
Examples of this type of mineralization include calcareous or siliceous stromatolites and other microbial mats. A more specific type of biologically induced mineralization, remote calcification or remote mineralization , takes place when calcifying microbes occupy a shell-secreting organism and alter the chemical environment surrounding the ...