222 STRATIGRAPHICAL GEOLOGY 



Feet. 



H 2 and 3 . Grey shales of Hostin with carbonaceous layers N i 



Hj. Grey shales, containing species of Orthoceras, Gyroccras, V- 850 



and Goniatites 



G g3. Nodular limestone with many Cephalopoda \ 



G g2. Calcareous shales with trilobites and brachiopoda j-1000 



G gl. Nodular limestone with a large fauna 

 .,-, fRed crinoidal limestone of Menan 1 



2 ' I White limestone of Konjeprus )' ' ' ' about 



1950 



Of this series only the lower two members are referable to the 

 Lower Devonian, of which they must be regarded as a concentrated 

 calcareous facies formed in fairly deep water and under condition 

 very different from those which prevailed in regions farther north 

 and west. The red and white limestones are really different facies 

 of one mass of limestone, the one often replacing or becoming 

 interbedded with the other. 



The interrelation and correlation of these limestones has been 

 the subject of a recent study by F. Seeman, 15 who calls them the 

 zone of Aphyllites fidelis, this species of Goniatite, together with 

 Mimoceras gracile and Anarcestes crispus, being common. 



The whole of Stage G belongs to the Middle Devonian, and 

 though near Prague there is a central band of shales, near Beraun 

 to the south-west it is, according to Seemann, entirely composed of 

 limestone, the lower beds being characterised by Anarcestes suit-' 

 nantilinus and the upper by An. occultus. Other common fossils 

 are : 



Bronteus Brongniarti. Gomphoceras biconicum. 



Phacops fecundus. Hercoceras niirum. 



Cheirurus Sternbergi. Pteria grandis. 



Goniatites fecundus. 

 Orthoceras annulatum. 



Chonetes novellus. 

 Coccosteus Agassizi. 



Seemann also refers H 1 , in which Posidonomya hians is the most 

 characteristic fossil, to the Middle Devonian, regarding the rest of 

 H as representative of the Upper Series. 



6. Poland and Russia 



North of Bohemia in Russian Poland, near Lagow and Kielce, 

 there is an interesting conjunction of an arenaceous littoral and a 

 calcareous marine facies. There the lowest Devonian Beds are 

 sandstones with Placoderm fish (Coccosteus, Heterosteus, etc.), 

 associated with other beds containing Spirifer paradoxus. These 

 beds must be referred to the highest Coblentzian or lowest Eifelian, 



