494 



STKATIGRAPHICAL GEOLOGY 



The following are common species which occur both in the 

 Selbornian and the Lower Chalk (Cenomanian) : 



Elasmostoma consobrinum, Catopyyus columbarius, Holaster Icevis, 

 Salenia petalifera, Peltastes dathratus, Pseudodiadema variolare, Ps. 

 ornatum, Discoidea subuculus, Kingena lima, Rhynchonella grasiana, 

 Lima globosa, Pecten asper, P. orbicularis, P. hispidus, Ostrca vesicularis, 

 Aucellina gryphonoides, Nautilus elegans. 



Fig. 169. GROUP OF SELBORNIAN FOSSILS (GREENSANDS). 



a. Nautilus elegans. 

 6. Salenia petalifera. 



e. Siphonia pyriformis. 



c. Peeten asper (young). 



d. Rhynchonella dimidiata. 



Fossils of the Loicer Chalk and Cenomanian 



Porifera. Stauronema Carter!, Plocoscyphia labrosa, P. fenestralis. 



Actinozoa. Micrabacia coronua. 



Eehinoderma. Discoidea cylindrica, Holaster subglobosus, H. 



trecensis, Cidaris vesiculosa. 



Annelida. Serpula umbonata, S. annulata. 



Crustacea. Enoploclytia brevimana. 



Brachiopoda. Rhynchonella Martini, R. Mantelliana, Terebratula 



semiglobosa, Terebratulina nodulosa. 

 LamellibrancMa. Ciicullsea mailleana, Inoceramus Crippsi, Lima aspera, 



Pecten elongatus, P. fissicosta, Plicatula inflata, 



Spondylus striatus, Unicardium ringmeriense. 



