317] G. E. Dorsey 119 



of the Senonian present. Here it is a sandy, chalky deposit, 

 and contains great numbers of fossils, B. mucronata among 

 them. This occurrence is very similar to the Maestrichtian 

 of the Baltic provinces and Belgium. 



In the Aquitanian region, conditions similar to those in 

 Touraine prevailed, except that here the Campanian in Cha- 

 rente does not carry B. mucronata at all, and the Maestricht- 

 ian, divisible into three zones, is present in its entirety. But 

 only in the lowest zone a white limestone, with bryozoa, 

 oysters, etc., is B. mucronata found. The upper two, con- 

 sisting of ferruginous sands and yellow limestones are proba- 

 bly too littoral in character to contain B. mucronata. Haug 

 calls the Charentian- Senonian neritic. In the south, in the 

 vicinity of Lyons, the Senonian, here apparently undifferen- 

 tiated rests upon the Albian, and contains B. mucronata 

 and Ananchytes ovatus. The matrix is a grayish white lime- 

 stone. Similarly, in the Alps, at Geneva, in a marly, gray 

 limestone, with siliceous beds of Foraminifera in the upper 

 part, the undifferentiated Senonian rests upon the Albian, 

 and contains B. mucronata, with Ananchytes ovatus, and 

 some Inocerami. Both of these occurrences are questionably 

 referred to the Maestrichtian. 



From the region of Lake Geneva, the Senonian deposits 

 occur in a narrow strip across the Alps, being especially well 

 studied in the northern and eastern Alpine regions. At 

 Tolz, in Bavaria, there is a greensand, containing sponges, 

 gastropods, and B. mucronata. Between Bergen and Teisen- 

 dorf, in the same region, are forms like the neritic species of 

 the Maestrichtian of Limburg, in a great thickness of marls 

 containing B. mucronata near the top. North of Salzburg, 

 in western Austria-Hungary, the Senonian, composed largely 

 of marls, contains B. mucronata. 



The " couches de Gosau," a name applied to a series of 

 conglomeratic and marly beds south of Salzburg, in the pro- 

 vince of Salzburg, is divided into five zones, the uppermost 

 of which, the marly "couches de Merenthal," contain B. 

 mucronata and are correlated with the Maestrichtian. In 



