248 Mr. Weaver on Floetz Formations. [Oct. 



beds in the old sandstone, rarely exceeding ten feet in thickness. 

 In this limestone have been observed terebratulites and 

 discites ; 



That both the coal shale and coal form beds of greater or less 

 continuity, but appear to close and terminate, both in the line of 

 range and of dip. These beds contain occasionally pyrites of 

 copper and iron, blende, and galena, in membranous flakes, or 

 disseminated ; and near Lobegiin, Wettin, and Dolau, they are 

 said to have contained nodules of cobalt also. 



The principal coal deposit of these countries is found in the 

 tract of the Petersberg, situated between Halle on the S, Wettin 

 on the W, and Lobegiin and Kathau on the N. And combining 

 the observations of M. Freiesleben with the communications of 

 MM. Schulze and von Veltheim, it appears clearly, that the coal 

 beds at Kathau underlie porphyry, at Lobegiin repose on por- 

 phyry, near Wettin again underlie porphyry, while at Raunitz, 

 south-east of Wettin, they repose on porphyry. Again, to the 

 east of Brachwitz, they appear to underlie porphyry ; while 

 between Halle and Giebichenstein, they are distinctly imbedded 

 in porphyry.* 



3. Lower Silesia, County of Glatz, and Part of Bohemia and 

 Upper Lusatia. — The old red sandstone (rothe sandstein of M. 

 von Raumer) is here found in two distinct tracts ; one being 

 situated to the north of the Riesengebirge, and the other being 

 spread over the southern side of the Riesengebirge and Eulenge- 

 birge. 



The northern formation reposes wholly on primary tracts. It 

 contains, and alternates with, subordinate beds of porphyry, 

 trap, amygdaloid, and limestone ; but only in one case has a 

 trace of coal been found in it ; namely, near Merzdorf on the 

 Bober. 



The southern formation of old red sandstone is similarly 

 constituted, yet contains numerous beds of coal + in its northern 

 and eastern quarters, where it adjoins the Eulengebirge, and 

 where it reposes partly on transition, and partly on primary 

 tracts ; but the western quarter of the formation, which rests 



• Upon the mutual relations of the old red sandstone and coal formation in general, 

 M. Freiesleben sums up his opinion in the following words : " That a portion of the real 

 coal formation is found subordinate to the rothe todtliegende, can no longer admit of 

 doubt. Even Lehman maintained that position, and it has been subsequently elucidated 

 and confirmed by the observations of Madihn, Gerhard, Lasius, Karsten, von Buch, 

 Heim, and von Hoff. MM. von Schlotheim and von HofFare even disposed to incor. 

 porate the whole of the coal formation (the coal rocks, properly speaking), with that of the 

 rothe todtliegende. On the other hand, M. Voigt, and some other mineralogists, have 

 deviated from the position of Lehman. For my own part, I consider the rothe todtlie- 

 gende and the true coal tracts (eigentliche steinkohlen-gebirge, composed of siliceous 

 conglomerate, coal sandstone, shale, bituminous shale, and coal), as two, nearly allied, 

 and yet distinct, formations; although I am also convinced that seams of coal are found 

 subordinate to the rothe todtliegende." — (See vol. iv. p. 170 — 173, with the notes.) 



t Von Buch. Geog. Beob. vol. i. p. 81— 90, and p. 101—103. 



