315] G. E. Dorsey 117 



Upper Chalk is found. Jukes-Brown (11, p. 322) says re- 

 garding this, "The white sandstones of the west coast are 

 overlain by a few feet of argillaceous greensand, passing up 

 into glauconitic limestone, the two being only five to seven 

 feet thick. . . . Above these is a bed of white B. mucronata 

 chalk, from three to ten feet thick, which is evidently a mere 

 remnant of a much thicker deposit." 



In England, the Belemnitella zone of the Upper Chalk has 

 been traced from Kent to Dorset, along the Channel, and 

 thence northeastward to Norfolk. It reaches a thickness of 

 100-160 feet in the Hampshire basin, and in Norfolk it 

 attains its maximum development. Near Norwich, Geikie 

 (12, p. 1193) describes it as a "white, crumbling chalk, with 

 layers of black flints, which have yielded abundant sponge 

 spicules." Everywhere in the British Isles where B. mu- 

 cronata has been found, it has been in a pronouncedly chalky 

 matrix. 



On the continent, around the eastern shores of the Baltic, 

 the Senonian is present as white cliffs, in Pomerania, in 

 Riigen, along the south shores of Sweden, and the Danish 

 islands. It is also present in Liinberg in east Prussia. While 

 some B. mucronata are recorded in the Campanian (Haug, 

 13, p. 1301), it is first mentioned in this region in the upper 

 Maestrichtian, in a lithology of persistent white chalk. Haug 

 remarks in connection with this occurrence that as in the 

 Paris Basin, the ammonites are rare, and one is certainly 

 in the presence of deposits of shallower seas than those over 

 Hannover and Westphalia. Ananchytes ovatus, Magas pu- 

 milis,, and Terebratula earned are abundantly associated with 

 the Belemnitellas. 



Passing to the vicinity of the Anglo-Parisian Basin, we 

 find in the neighborhood of Lille, and in the province of 

 Hainaut in Belgium, the Campanian very slightly fossil- 

 iferous, but the Maestrichtian well represented by six zones, 

 according to Haug (13, p. 1302-3), in every one of which 

 B. mucronata is recorded. The lithology varies from a phos- 

 phatic conglomerate at the base, with broken remains of B. 



