218 Dr. R. L. Sherlock — Foraviinifera of Speeton Clay. 



Professor A. P. Pavlow ^ correlates these divisions with those of 

 the Continent as follows : — 



[Aptien] = B. 



Barremien = Cj^-C^ [an evident misprint for Cj^-C^]. 



Hauterivien= Cg-C;^;^. 



Yalengien = D-^, lower part, Dg. 



Upper Tithonian = D^-Dg. 



No Foraminifera whatever were found in divisions F and E (Upper 

 Kimeridge^). I have not any specimens from A, and in the case of 

 B only from the basal bed. Theoretically D should have proved the 

 most interesting, as doubts have been expressed whether this division 

 should be regarded as Jurassic or Cretaceous, but Poraminifera are 

 comparatively rare in D. However, some evidence has been obtained 

 and will be referred to later. Of the eight subdivisions of D, 

 Foraminifera have been found in Dj, Dg, and Dg only. 



In Cj^, which is certainly of Lower Cretaceous age, Foraminifera 

 were found in C^^, Cg, Cg, C^, Cg, and C;|^q of the eleven subdivisions, 

 but I have no material from C^, Cg, and Cg. In B the base was 

 alone examined, and proved to be one of the best horizons for 

 Microzoa. I have not found specimens from any bed higher than the 

 base of B. 



The information obtained is summarized in the following notes on 

 the divisions examined, commencing with the lowest bed. 



F. Upper Kimeridge. The extreme top of F is a black shale which 

 is most difficult to break up for the purpose of separating any 

 Microzoa that may be present. A few minute white spherical bodies 

 may be the initial cells of Foraminifera. 



Dg. The base of Dg contains selenite, an. indication that any 

 calcareous Microzoa have been destroyed. The horizon is interesting 

 mineralogically as it contains grains of garnet, kyanite, and other 

 heavy minerals, together with quartz-sand and a few grains of 

 phosphate. 



Dy (the blue band). Only traces of shells remain, the rest have 

 undergone decomposition. 



Dg (lower part). Crystals of selenite indicate destruction of 

 calcareous fossils. 



D (middle part). A few Foraminifera and Ostracoda were found. 

 The former comprise Nodosaria sp., Marginulina jonesi, Reuss, 

 Rhabdogoniwm ituigne, Beuss, Vaginulina sp. (fragment), Cristellaria 

 acutaxirimlaris (Fichtel & Moll), C. cuUrata (Montfort), C. gauUina, 

 Berthelin, C. rotulata (Lamarck), Puhinulina caracolla (Eoemer), 

 glauconite casts of Cristellarians, and an arenaceous form. There are 

 a few grains of a transparent cubic mineral which is probably garnet, 

 and grains of coloured quartz. 



■^ " On the Classification of the Strata between the Kimeridgian and 

 Aptian" : Q.J.G.S., vol. lii, pp. 542-55, pi. xxvii, 1896. 



^ A recent paper by Dr. Hans Salfeld (Q.J.G.S., vol. Ixix, pp. 423-32, 

 pis. xli, xlii, 1913) indicates that Portlandian beds may be present in this 

 division of the Speeton Clay. 



