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ISO LIMESTONE FAMILY. First Kind. Common Compact Limestone. Gemeiner Dichter Kalkstein, Werner. Calcareus eequabilis, Wall. t. i. p. 122.—Dichtcr Kalkstein, Wid. s. 494.—Compact Limestone, Kirn, vol.i. p. 82.—Gemeiner Dichter Kalkstein, Emm. b. i. s. 437-—Pietra calcarea com pacts, Nap. p. 33.—La pierre calcaire compacte commune, Brock. t. i. p. 523.—Chaux carbonatee compacte, llauy, t. ii. p. 166. Gemeiner Dichter Kalkstein, lleuss, b. ii. 2. s. 262. Id. Lnd b. i. s. 146. Id. Suck. l r th. s. 585. Id. Bert. s. 88. Id. Mohs, b. ii. s. 14. Id. Hab. s. 71- Id. Leonhard, Tabcl. s. 32 Chaux carbonatee compacte, Brong. t. i. p. 19!)— Gemeiner Kalkstein, Havs. s. 126.—Dichter Kalkstein, Kar- sten, Tabel. s. 50.—Chaux carbonatee compacte, llauy, 1 abl. p, 4,.—Dichter gemeiner Kalkstein, Lenz, b. ii. s. 732.— Ungeformiter Kalk, Okcn, b. i. s. 410. External Characters. Its most frequent colour is grey, of which the follow ing varieties have been observed : yellowish, bluish, ash, pearl, greenish, and smoke grey ; the ash-grey passes in to greyish-black; the yellowish-grey into yellowish- brown, ochre-yellow, and into a colour bordering on cream-yellow. It also occurs blood-red, flesh-red, and peach-blossom-red, which latter colour is very rare. It frequently exhibits veined, zoned, striped, clouded, and spotted coloured delineations; and sometimes also black and brown coloured arborisations. It very rarely exhibits a beautiful play of colours, caused by intermixed portions of pearly shells. It occurs massive, corroded, in large plates, rolled masses, and in various extraneous external shapes, of univalve, bivalve, and multivalve shells, of corals, and of fishes,
