a sedimentary rock consisting mainly of calcium carbonate, often composed of the organic remains of sea animals, as mollusks, corals, etc., and used as building stone, a source of lime, etc.: when crystallized by heat and pressure it becomes marble
High, rich in hematite iron ore; valuable limestone deposits are found some 30 m.
Limestone, iron and coal are also found.
The opening was filled with ferns which completely covered the beds of limestone and in places hid the streams.
Gabe paced as Tamer climbed a ladder to tablets stacked at the top of one limestone shelf.
Birmingham, situated in an immensely rich iron, coal and limestone region, is the principal manufacturing centre in the state, and the most important centre for the production and manufacture of iron in the southern states.