W. F. Hume — Notes on Russian Geology. 



387 



The beds evidently correspond to the highest series in the above 

 tables, as they are soft white Chalk, and immediately underlie the 

 Green Tertiary Sandstones. These beds yielded a most abundant 

 crop of Belemnitella mucronata, but beyond these, and a fragment of 

 a thin-shelled Inoceramus, no other forms were obtained. 



Prof. Armachevsky, who has been engaged in the task of mapping 

 the northern portion of the area now under discussion, has examined 

 the exposures of Chalk and Chalk Marl displayed in the courses of 

 the Elvers Siem and Psiol, (A large number of localities are 

 given by him which I need not mention here). The strata consist 

 in the main of a white, massively-jointed Chalk, Chalk Marl only 

 cropping out in the N.E. corner, towards Kursk. The following 

 fossils occur in the first-named : Cidaris vesiculosa, Echinocorys ovata, 

 Terehratula carnea, Ostrea vesicularis, and Pecten splendens. 



MAP OF SOUTH EUSSIA (Central Portion) Referred to in paper 



Archcean Carboniferous Permian. Doubtful Approximate 



(Gneisses and (Shales, Sand- (in this area Boundary of 



Granites). stones and Cretaceous, Jurassic, Upper 



Limestones). and Carboniferoiis .Cretaceous, 



have been met with). 



The Tertiary Beds covering a large part of the coimtry are treated as thozigh they had 

 been denuded away . 



a toh indicates Line of Section on Map. 



Tn the Tchernigov Government to the N.W. a large series of 

 fossils have been met with, but they seem to show that the zonal 

 arrangement holds far less for this E. end of the European 



