Geological essays - Tapa blanda

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1799 edition. Excerpt: ...and Werner's Letter to Lelke in 2 Biblioth. du Nord, 81. 5 Indurated Lithomare-a. o It sometimes bears the impressions of reeds; and is found stratified in coal mines. Emmerl 357. 359. It passes into indurated clay, or mountain sope, or steatites. Emmerl. Ibid. R 2 6. Rubble 6. Rubble Stone, or Slate, Petrifactions, as hysteriolites, mytilites, &c. are found in it, or impressions of reeds, or ruslies, and madrepores, at the depth of 1200 feet. Lafius, 2,06. Lefke, G. 874. Wern. K. Claffif. 18. It sometimes covers conchiferous limestone. 1 Berg. Jour. i793, 199. It is frequently metalliferous; the substances of that fort it bears are galena, copper, and sulphur pyrites, bismuth and cobalt. 2 Lenz. 391. It alternates with, and frequently passes into, argillite and sandstone. % Lenz. Ibid. A siliceous sandstone mixed with argillite at Bornholm, is called a rubble stone, 5 Berl. Beob. 94. hitherto it occurs principally in the Hartz. 7 Argillaceous % or ferruginous Sandjlone. Sandstone, with an argillaceous or ferruginous cement, frequently forms whole stratified mountains in Saxorfy and Bohemia. Charpent. 41, &c. the strata are often of considerable thickness, and horizontal; the 6 uppermost uppermost and lowermost often the loosest; the interior of each stratum the hardest. Ibid/ 44. The lowest parts contain petrifactions. Ibid. The cement is argillo-ferruginous. In Normandy the ferruginous sandstone, called ronjjier, consists of calcareous gravel in a ferruginous cement; it contains ostracites, Mem. Par. 1763, 404, in 8vo. 81, in 4to. but more commonly the granular part is of the siliceous genus. Werner, ij. The petrifactions found in sandstone are most commonly orthoceratites, chamites, tellinites, ostfacites, &c. and often the...