120 Belemnitella Americana, and Mucronata [318 



the southern Alps, B. mucronata occurs in a thick series of 

 marly limestones, with a fauna composed of pelycypods and 

 cephalopods, known as "Petage de Brenno." 



In the East Russia-Poland-Carpathian region, the chalk 

 covers vast areas, and everywhere has the same facies as that 

 of the Anglo-Parisian Basin and north Germany. Over 

 Poland and East Eussia the greater part of the fossils come 

 from the Maestrichtian, which is a typical chalk. To the 

 south, although the Maestrichtian is present over large areas, 

 its facies has so changed (to sands and clays) that B. mu- 

 cronata is rarely present. When, however, we do find it, the 

 accompanying lithology is unchanged. In the Bulgarian pla- 

 teau and the Dobrudja, there is a thick series of Senonian 

 age, whose upper part is composed of white, porous lime- 

 stones, with siliceous lenses,: in every way, Haug says, like 

 the Anglo-Parisian Maestrichtian, and here we find B. mu- 

 cronata. In the Crimea, the Campanian and lower Maes- 

 trichtian are composed of white chalk, in which B. mucronata 

 is present. The Senonian of the Caucasus is usually a white 

 chalk, very similar to that of the Anglo-Parisian basin, and 

 with B. mucronata. Near Toupiniza, in Servia, an occur- 

 rence of B. mucronata is mentioned in marly sands, but this 

 is very near the region of the Dinaric Alps, where the chalky 

 limestone facies, which is characteristic of the Maestricht- 

 ian in most of eastern Europe, is absent. The geology of 

 Croatia, Dalmatia, and Bosnia is in such an unknown con- 

 dition, that exactly what is present can not be said, but no 

 record of B. mucronata was found. 



Passing from the Balkans, the next, and last, occurrence 

 of B. mucronata is in the Magishlak peninsula, on the north- 

 east coast of the Caspian Sea. Here the following beds are 

 differentiated (13, p. 1337) : 



Zone 1 A white chalk, with Ananchytes ovatus, Inoceramus bal- 

 ticus, Pycnodonta vesicularis, Belemnitella mucro- 

 nata. 



Zone 2 A marly and glauconitic chalk, with Ananchytes ovatus, 

 Magas pumilis, Pycnodonta vesicularis, Scaphites 

 schluteri, Hamites roemeri, B. mucronata. 



