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.
References in periodicals archive ?
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).
A NEW CLASS AND ORDER FOR THE VEGETATION OF AEROPHYTIC MICROAL-GAL FILMS ON CALCAREOUS ROCKS
The leaching of pyrite and chalcopyrite to malachite azurite hematite and limonite are ubiquitous along these zones while iron ores formed as a result of skarnification are commonly hosted by calcareous rocks within these volcanics.
Such high quantities of low-resistivity minerals within high-resistivity Devonian and Triassic calcareous rocks may influence the geoelectric properties of the rock mass.
It predominately occurs on calcareous rocks but occasionally inhabits siliceous substrates.
The rest of calcareous rocks present in the studied sequence are easily recognize using a logic function, where all sections with photoelectric factor equal or higher than 4 are classified as laminated calcareous rocks, as long as they were not previously classified by the first SVM nor the second.
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.
grandis was found in Pleistocene terraces over reefs or calcareous rocks near Cartagena (Colombian Caribbean; 10[grados]20' N, 75[grados]25' W).
This diversity is responsible for the differential erosion, which has clear effects on the relief at many different scales: the marked relief of calcareous rocks and sandstones with their steep slopes and large scarps is in sharp contrast to the solid, massive forms of granitic batholiths, while marls open up the wide corridors formed by the main river network, and the slates adopt slightly raised convex forms, susceptible to movements en masse.
The weathered zone just above bedrock ranges from neutral to mildly alkaline (pH 7.1 to 7.6, the latter over calcareous rocks).
Calcareous rocks (marbles, metacarbonates and calc-silicate rocks) represent only a relatively small fraction of the crust but their metamorphism is important because it can reveal significant information about the composition of the metamorphic fluid phase as well as P-T conditions (Spear, 1993).