﻿Dr. Feistmantel — Bohemian Coal Fauna and Passage-Beds. Ill 



stones (arcoses) with a richly Kaolinic cement, and inchiding nu- 

 merous silicified coniferous stems of the genus Araiicarites in the 

 same condition as we find them in Northern Bohemia in the true 

 Permian formation. Of these Eed Sandstones I gave lately two 

 sketches in my Versteinerungen der bohm. Kohlenformation, Cassel, 

 1876, ph xiii. 



These Eed Sandstones are mostly developed in the southern 

 part ; we find them on the railway (from Pilsen to Fnrth, in 

 Bavaria), near Weipernitz, and especially near Zwug, Kothon- 

 jezd,' Auherzen, etc. Also here we find numerous stems of Arauca- 

 rites, and I have no doubt these Red Sandstones are truly Permian.^ 



/. General View of the Strata in the Pilsen Basin. 

 (descending order.) 



!a. With Araucarites. 

 b. Spherosiderites, with animal-remains of Permian affini- 

 ties near Ledec and Zilow. 



f Shales with Carboniferous Flora. 



2. Upper Coal-seam I t;oal-seam. 



District "1 J^^i^schan Gas-coal, with Carboniferous Flora and a Fauna 



I of generally Permian character. From this horizon 



|_ Dr. A. Fritsch has made his largest collections. 



3. Lower Coal-seam ( Shales and Spherosiderites with Carboniferous Flora. 



District \ Coal-seam. 



Every one studying this table will perceive that No. 1 is truly 

 Permian, No. 3 is truly Carboniferous, and No. 2 must be taken as 

 a passage-bed, as I have represented it in my later papers,^ while 

 in the first papers I took it as lowest Permian, judging from the 

 animal-remains only. 



Dr. Anton Fritsch, before the Glasgow meeting, pronounced the 

 Niirschan Gas-coal also as a " passage-bed," a view which I had ad- 

 vocated already three years ago (1873). The historical development 

 of the difi'erent opinions I give further on. 



2. The Coal-field of Kladno-RaTconitz. 



a. The Eakonitz Gas-coal, locally called "Schwarte." 



This Coal-field is in the north-western portion of the area men- 

 tioned above. It extends generally E.N.E., and is the richest of the 

 Bohemian Coal-fields. There is the same classification here as in 

 the Pilsen Coal-basin. 



The Lower Coal-seam District. 



This lies immediately on Silurian rocks, and has a northern dip; 

 the southern boundary runs from the locality Kralup (twenty 

 English miles north of Prague) westwards across the localities 

 Minitz, Wotwowitz, Zakolan, Brandeisl, Kladno, Lahna, Euda, 

 Eakonitz, Lubna, Petrowitz, and so on. 



1 This village Eothonjezd (Roth = red) has certainly obtained its name from the 

 red colour of the soil, which is caused by the decomposed Eed Sandstones. 



'^ Professor Krejci of Prague is also of the same opinion. 



8 Jahrb. d. k. k. geolog. Reichsanst. 1873 ; Abb. d. k. bohm. Gesellsch. d. 

 Wissenschaften, 1874; Verst. d. bohm. Kohlenablagerungen, Cassel, 1874. 



