104 STRATIGRAPHICAL GEOLOGY 



Thuringia Wald, north-east of Bavaria, but it is only at Leimitz, 

 near Hof, that well-preserved fossils have been obtained ; the fauna, 

 consisting chiefly of Trilobites, Brachiopoda, and a few Cystidea, 

 appears to belong to the highest Cambrian (Upper Tremadoc and 

 Ceratopyge limestone). 



In Bohemia the existence of Cambrian rocks was first made 

 known by Barrande in 1852, when he recognised his Stage C 

 as containing a "primordial fauna." Subsequent writers have 

 modified Barrande's classification, and have found a still older 

 fauna in his Stage B. To agree with the British Cambrian System 

 it must also include part of D, and will then consist of the following 

 groups : 



Stage D 1. Pisolitic ironstones, sandstones, and sandy conglomerates 



with diabasic lavas and tuffs. 

 Stage C. Greenish slates with a Paradoxides fauna (P. bohemicus and 



P. spinulosus), Conocoryphe, Arioncllus, Ellipsocephalus, etc. 

 Stage B. Sandstones and flags with an Olenellus fauna passing down 



into coarse conglomerate which rests unconformably on Stage A 



(Przibram schists). 



A more detailed study of this Cambrian Series has been made 

 by Pompeckj, 31 who describes the lowest part (Stage B) as consisting 

 of a conglomerate passing up into grits, sandstones, and flags which 

 contain species of the Trilobites /Sao, Solenopleura, Ellipsocephalus, 

 and Ptychoparia, with Stenotheca and Orthis ; this is an Olenellus 

 fauna, though that genus has not yet been found. Dr. Marr 32 

 remarks that these rocks strongly resemble our Harlech Series and 

 are of great thickness. The Paradoxides Beds are slaty shales with a 

 thickness of about 1000 feet. Above them is a conglomerate 

 supporting greenish grits which contain Lingula Feistmanteli and 

 probably represent part of our Lingula flags. Above these are 

 pisolitic ironstones of black, green, and red colours which contain 

 a few fossils Erinnys Grimmi, Amphion Lindnaueri, and Orthis 

 desiderata ; this small assemblage having the aspect of a passage 

 fauna and being therefore probably of Tremadoc age. 



From this account it will be seen that the Bohemian sequence 

 is not quite complete ; in fact, there seems to be a break and un - 

 conformity between Stages C and D. The beds of Stages B and C 

 are only found over a small portion of the area near the town of 

 Beroun, and are overlapped by the conglomerates of D 1 which 

 then resf; directly on the Archaean rocks. Moreover, no species of 

 Olenus has yet been found in Bohemia, from which it may be 

 inferred that there is little if anything to represent the lower and 

 middle parts of our Lingula flags, the Lingula grits of Stage D 

 corresponding probably with the Dolgelly Beds of Wales. The 



