566 ON EOCENE FOEMATIONS OF WESTERN SERVIA. 



I. II. 



Carbon 49-2 49*3 



Hydrogen 1*1 1'2 



Water of combination 30-2 30-5 



Water, hygroscopic 19*5 19-0 



100-0 100-0 



The quantity of ash amounts to between 5 and 7 per cent. ; it 

 consists chiefly of alumina, magnesia, lime, iron-oxide, and silica. 



The argillaceous deposits of the neighbourhood, from which the 

 paraffin shales were formed, are evidently of marine origin and 

 contain abundance of fossils belonging to the genera Ostrea, Ceri- 

 thium, Cyrena, Nautilus, and Voluta, besides numerous Xummulites 

 and abundance of marine Diatomaceae, the assemblage indicating an 

 Upper Eocene age. Eemains of marine Yertebrata, principally 

 Teleostean and Selachian fishes, also occur in the clays. Eruptive 

 porphyritic and trachytic rocks have been intruded abundantly into 

 these clays. The former gave on analysis : — 



Alumina 1840 



Iron-oxide 2*69 



Manganous oxide 0*82 



Lime 0-36 



Magnesia 0-12 



Potash 1-23 



Soda 0-16 



Silica 75-51 



The analysis of the trachytic intrusive rock gave 



Alumina 20-82 



Iron-oxide 5-03 



Manganous oxide 0-01 



Lime 1-98 



Magnesia 0-51 



Potash 7-03 



Soda 3-10 



Phosphoric acid 0-03 



Silica 61-49 



100-00 



