DOMAIN II. SILICEOUS. 



5 Berl. Beobacht. Also that mentioned in 2 

 Sauss. 763, which graduates into gneiss, must 

 also be primary, though it contains tumblers (cail- 

 lous route's). The sand-stone near Lischau, iij 

 the vicinity of Prague, graduates into horn-stone, 

 and even into granite. Mr. Rosier even thinks it 

 to have been originally a granite, whose felspar 

 was decomposed into clay, which then cemented 

 the quartzy grains; a most ingenious and pro- 

 bable conjecture. 1 Bergbau. 339 and 341. 



" Most of the arenilitic mountains of Bohemia, 

 on both sides of the Elbe, appear to be primitive, 

 by Reuss's description. See Reuss, 96, &c. In 

 the east and north parts of Bohemia, many of 

 them are split, or form columns resembling ba- 

 salts. 2 Berg. Journ. 1792, 70. 



" In Bohemia, sand-stones with an argillaceous 

 cement alternate with those whose cement is sili- 

 ceous. Reuss. In Kinneculla, the lowest stratum 

 incumbent on granite seems also to be primitive ; 

 over it the secondary strata repose, 29 Swed. 

 Abhand. C. 29- 5 Bergm. 126. 



" In Brainsdorf, in Saxony, it passes into schis- 

 tose mica, and alternates with argillite. 2 Crell. 

 Beytr. 64. In Reigelsdorf it forms the funda- 

 mental rock on which semiprotolite immediately 

 lies, which is covered with other secondary strata. 

 2 Berg. Jour. 1790, 285. Near Oyben, and in 



