GEOLOGICAL EANGE 265 



beds for Germany, and Berthelin for France. An 

 idea of the profusion of Foraminifera in this forma- 

 tion may be gathered from the fact that in this 

 comitry, from the Folkestone cHffs alone, the writer has 

 described 265 species, comprised within 43 genera. 

 The Gault fauna embraces among its commoner 

 types such genera as Nuheciilaria, Miliolina (Upper 

 Clault), Hdplophragmium, Auimodisciis, Textularia, 

 Gaudryina, Trita.ria (most frequent in the Upper 

 Gault), JBulimiiui (chiefly in the Upper Gault), iVor?o- 

 saria, FrondicularUi, Filiahdogonium (Upper Gault), 

 Vaginulina, Cr'ideJhiiia, GJobigeri/ia,AnomaIi)i(f, and 

 Pulvi7iulina. 



The Eed Chalk of Yorkshire and Norfolk is 

 apparently the equivalent of certain zones of the 

 Upper Gault and Greensand, although so lithologi- 

 cally distinct. This is especially borne out by a 

 comparison of the Foraminifera. 



The Greensand of New Jersey, a formation of 

 equivalent and later ages to those just named, has 

 yielded an abundant foraminiferal fauna, and many 

 of the species have developed to a comparatively 

 large size. They have been studied by Eeuss, 

 Woodward, and Bagg, the latter author having 

 largely added to the list of late j^ears. 



The Upper Greensand in Devonshire contains a 

 chert bed, which in places is almost entirely 

 composed of the large tests of Orhitolina concava ; 

 and the gravels in the neighbourhood of Haldon 

 Hill consist largely of this foraminiferal rock. The 

 calcareous shells are in this chert-rock entirely 



