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Calc-tuff an© Calc-sinTer. r taining the remains of extina quadrupeds ; and thefe being accompanied with frclh-water Ihells, but never with marine fhells. (2 ) Calc-fmter.—lt occurs principally lining and •filling up fiffures and caverns. CHAP. X. Class V.—Volcanic Rocks. V ulkanifche-Gebirg e * Werner. There are two kinds'of volcanic rocks; pfeui>- • • -1 fl volcanic, and volcanic. 1. Pfeudo-volcanic Rocks. Pfeudo-vulkanifche Gebirgfarten. Vl/erncr. The pfeudo-volcanic rocks are the ..Burn,day; a. Porpclain.jaJp'r; 3- 4. Columnar day;ronpne , and, 5- ft . . , Burn, day. Its colour .s ufua ly red , >t fometimes alfo occurs grey, yellow brown, and Very feldom is fpotted or ftriped. It fometrmes contains impreffions of plants. ^