Gault. 



219 



molluscs the following are characteristic : Terehratula 

 biplicata, Rhynchonella sulcata, Oysters, Pectens, 

 Plicatula pectinoides, Pinna tetragona, &c. ; Gervillia 

 solenoides, Inoceramus sulcatus, &c. ; Lima paral- 

 lela, Cucullcea, Area, Nucula pectinata, &c. It also 

 yields Gasteropoda of the genera Dentalium, Solarium, 

 Scalaria, Natica Gaultina, Pleurotomaria Gibbsii, 

 Rostellaria carinata, &c., and many Cephalopoda, such 



FIG. 43. 



Inoceramus sulcatus. 



Natica Gaultina. 



Rostellaria carinata. 



Lima parallela. 



Nucula pectinata. I'licatula pectinoitles. 



Group of Gault Fossils. 



as Belemnites minimus, &c. ; Nautilus inequalis, &c. ; 

 Ammonites splendens, A. dentatus, A. interruptus, 

 A. lautus, &c. &c. ; Ancyloceras spinigerum, Hamites 

 attenuatus ; H. rotundus, &c. Traces of the Grault 

 may probably be found along the lower outskirts of 

 the Chalk all the way to Filey Bay in Yorkshire, 

 where the Eed Chalk has by some been considered 

 to be its equivalent, or, at all events, to be of a 



