calcareous
71Mollusc shell — Closed and open shells of a marine bivalve, Petricola pholadiformis. A bivalve shell is composed of two hinged valves which are joined by a ligament …
73Sedimentary rock — Middle Triassic marginal marine sequence of siltstones (below) and limestones (above), Virgin Formation, southwestern Utah, USA Sedimentary rock are types of rock that are formed by the deposition of material at the Earth s surface and within… …
74Coral — For other uses, see Coral (disambiguation). Coral Pillar coral, Dendrogyra cylindricus Scientific classification Kingdom …
75Micropaleontology — Fusulinid (Triticites) from the Plattsmouth Chert, Red Oak, Iowa (Permian). Micropaleontology (also sometimes spelled as micropalaeontology) is the branch of paleontology that studies microfossils. Contents …
76Pachypodium habitats — consist of isolated, specialized, micro environmental niches, generally xeric, rocky, frost free areas within parts of western Madagascar and southern Africa. Pachypodium species are often indifferent to the regional ecological, biotic zone of… …
77Geology of the Iberian Peninsula — The geology of the Iberian Peninsula consists of the study of the rock formations on the Iberian Peninsula, which includes Spain, Portugal, Andorra, and Gibraltar. The peninsula contains rocks from every age from Ediacaran to Recent, and almost… …
78Bruno Granier — Pour les articles homonymes, voir Granier. Bruno Granier (né le 15 février 1958[1]) est professeur de seconde classe à l université de Brest (connue localement sous le nom d Université de Bretagne occidentale), où il enseigne la… …
79cement — cementable, adj. cementer, n. cementless, adj. /si ment /, n. 1. any of various calcined mixtures of clay and limestone, usually mixed with water and sand, gravel, etc., to form concrete, that are used as a building material. 2. any of various… …
80coral reef — a reef composed mainly of coral and other organic matter of which parts have solidified into limestone. [1735 45] * * * Ridge or hummock formed in shallow ocean areas from the external skeletons of corals. The skeleton consists of calcium… …
