118 Belemnitella Americana and Mucronata [316 



mucronata, through chalks of varying degrees of purity, with 

 an occasional conglomerate intercalated, to the basal con- 

 glomerate of the "tuffeau de Ciply," which transgresses the 

 two upper zones of the Maestrichtian proper. In the pro- 

 vince of Limburg, in Belgium, the Campanian, though glau- 

 conitic, has not as yet yielded any Belemnitellas ; but the 

 Maestrichtian, here divided into five zones, contains B. mu- 

 cronata throughout. It is worth while looking at the lithol- 

 ogy of each of these for a moment (13, p. 1303-4) : 



Zone 1 (oldest) Glauconitic chalk with B. mucronata. 



Zone 2 Pure white or marly gray chalk, without flints, with B. 



mucronata. 

 Zone 3 Thick white chalk with black flints, with B. mucronata, 



grading off laterally into the Kunraed limestone, 



marly, gray, very fossiliferous, but no B. mucronata. 

 Zone 4 Tuffs, with gray flints, with B. mucronata. 

 Zone 5 Tuffs, with numerous gastropods, and a few cephalopods, 



among these being B. mucronata. 



Haug, referring to this succession (p. 1304), says the 

 Maestrichtian of Limburg is essentially a neritic formation, 

 offering few or no paleontologic affinities with the bathyal 

 type of the stage, such as existed in the northeast of Germany. 



In the Paris Basin, proper, the Upper Senonian is divided 

 according to Grossouvre, into the following : 



Campanian 



Zone 1 Gray chalk of Hardivillers. 



Zone 2 Upper Chalk of Reims, White Chalk of Hardivillers, 



and Chalk of Michery, with B. mucronata. 



Maestrichtian (craie de B. mucronata) Chalk of Meudon, of Mon- 

 terau, and of St. Aignan, with B. mucronata. 



The fauna of the chalk of Meudon is very rich, but ammon- 

 ites are rare in it, while Inoceramus, Pecten, Ostrea, and 

 Brachipoda are well represented. In the southern part of 

 the Paris Basin the Maestrichtian is represented by only its 

 lower beds, the time of the typical Maestrichtian of the 

 northeast being a period of emergence in this region. In 

 Normandy, however, the Maestrichtian is the only member 



