limestone

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Related to calcareous rock: carbonaceous rock

limestone

A rock formed of organic fossil remains of shells, composed mostly of calcium carbonate.

limestone

rock which is largely calcium carbonate, used as a livestock feed when ground. Contains 38% calcium and is used as a calcium supplement. See also dolomite.
References in periodicals archive ?
Occurring on calcareous rocks, concrete, and on lignicolous and rarely, corticolous substrates, this species is widespread across western North America and eastward in the northeastern United States and adjacent Canada.
On calcareous rocks they include the decarbonated red soils showing little migration of clays in the profile (chromic), and the soils that retain significant quantities of carbonates, normally on argillic materials (calcaric).
The H2O released from the dehydration of pelitic schists probably infiltrated the calcareous rocks promoting decarbonization, which can explain the transformation of forsterite to Ti-clinohumite.
A NEW CLASS AND ORDER FOR THE VEGETATION OF AEROPHYTIC MICROAL-GAL FILMS ON CALCAREOUS ROCKS
Such high quantities of low-resistivity minerals within high-resistivity Devonian and Triassic calcareous rocks may influence the geoelectric properties of the rock mass.
However, up to now only the more calcareous rocks of the Juuru, Raikkula, and the lower part of the Adavere regional stages, corresponding to the lower and middle Llandovery, have been sufficiently well studied.
reniformis settles on calcareous rocks through the partial incorporation of outgrowths of this substratum by the lower ectosome.
The principal orebodies, which lie in a belt some 100 km to the west of Uppsala, are contained within distinct, but extensive, horizons within coarse-grained acid volcanics (locally referred to as leptites), while the calcareous rocks host skarn deposits at their boundaries with the intrusive core of the district.
The Camp Zone Target is a disseminated gold target which occurs in a structural/stratigraphic domain (the Southern Domain) characterized by strataform alteration and mineralization hosted by a previously unmapped sequence of calcareous rocks.
Free lime (CaO) makes up approximately 40-45% of the white slag material and reuse of this would reduce pressures on natural limestone resources (as well as reduce the considerable energy inputs and emissions involved in converting calcareous rocks into limestone).
The former has been widely studied and described, and comprises a landscape dominated by calcareous rocks, while the second is restricted to a small valley in a siliceous mountain range, with the presence of both substrata.
The aureole is larger in the north and east margins (up to 75 m) where metasedimentary calcareous rocks were metamorphosed to diopside-plagioclase-calcite-garnet-quartz hornfels (Lookwood, 1965).