434 



F. G. H. PRICE ON THE BEDS BETWEEN THE 



is only 3 or 4 feet thick, and contains many small phosphatic nodules. 

 The Upper Greensand seems to die out to the west of this point." 



The same authority states* that "there is no further exposure of 

 this Greensand until we reach Aylesford, where only about 18 inches 

 of it is found beneath the Chalk Marl. At Burham brick-pit it is 

 less distinct ; but green grains and phosphatic nodules occur at the 

 top of the clay." 



Owing to the frequent landslips which have taken place in East- 

 Wear Bay, no other entire section that is reliable is to be seen. Its 

 junction with the Chalk Marl can be made out very well upon the 

 shore, where large masses have been thrown down ; there it will be 

 observed that this so-called Upper Greensand passes gradually and 

 almost imperceptibly into chalk marl. In the lower parts of the 

 deposits clayey pipings are frequently met with, also iron pyrites in 

 the form of cubes ; but the latter are not found in the upper part. 



The following fossils have been met with in this bed : — 



Stauroneina Carteri, Sottas (common). 



lobata, Sollas. 



Hylospongia. 



Plocoscyphia mreandrina (common). 



Pseudodiadema, sp. 



Inoceramus concentricus ? 



— — striatus ? 



Avicula gryphaeoides (common). 



Plicatula inflata. 



Pecten orbicularis (common). 

 Lima globosa (rare). 

 Cardita, sp. 

 Nautilus, sp. 



Ammonites varians (very rare). 

 Scaphites sequalis. 

 Ichthyosaurus campylodon. 

 Lamna, sp., and Fish-scales. 



In the lower portion of this deposit fossils are rarely found at all, 

 owing, probably, to the chemical constituents being unfavourable to 

 the preservation of organic remains. They mostly occur in that 

 portion of the bed which is composed of whitish marl mixed with 

 green grains. The lowest fossil met with was Hylospongia. All the 

 fossils that are found in this bed No. I. are Chalk-Marl forms and 

 do not represent the fauna of the Upper Greensand of the West of 

 England at all. 



Upon carefully examining this bed, in company with Dr. Charles 

 Barrois, of Lille, I have come to the conclusion that the Upper 

 Greensand is wanting in the south-east of England (unless it be re- 

 presented palasontologically by the Upper-Gault beds X, and XL, 

 zone of Ammonites rostratus of my Gault-section), and that the dark 

 green sandy deposit just now described forms the basement-bed of 

 the Chalk Marl, they being palasontologically the same. I shall 

 therefore propose to do away entirely with the term Upper Green- 

 sand for this bed, and henceforth to consider it as the basement-bed 

 of the Chalk, and to unite it with the Chalk Marl, considering it 

 the sandy base of that formation. This is the zone of Stauronema 

 Carteri, which only occurs in this bed. 



This bed equals the " Niveau de Pecten asj>er," of Dr. Barrois, see 

 his paper on " La Zone a Belemnites plenus," Lille, 1875. 



At Wissant this bed is extremely rich in fossils ; but they are not 

 of the Upper-Greensand fauna. 



* < 



Geology of the Weald,' W. Topley, p. 153. 



