UPPER EOCENE (bARTON AND UPPER BAGSHOT FORMATIONS). 605 



Terebellum sopitum. 

 Voluta humerosa. 

 Ficula nexilis. 

 Natica, sp. 

 Trochita aperta. 

 Ostrea plicata, 

 Pecten carinatus. 



, sp. 



Lima, sp. 

 Avicula media. 

 Area, sp. 



Pectunculus deletus. 

 Limopsis scalaris. 



Nucula bisiilcata. 

 Ohama squamosa. 

 Cardium porulosum. 

 Lucina gibbosula. 

 Orassatella tenuisulcata. 

 Anisocardia, sp. 

 Cardita oblonga. 

 Cytherea. 

 Tellina ambigua? 

 Corbula ficus ? 

 Panopaea corrugata. 

 Schizaster D'Urbani. 

 Ditrupa. 



The ironstone band at the base of the next division seems to 

 occupy somewhat the position of the shell-band at Barton. Th& 

 total thickness we assign to the middle Barton here is 90 feet ; but 

 the subdivisions cannot be exactly correlated, and we were not able 

 to make any collection of fossils from this part of the series. The 

 thickness, 55 feet, assigned to the Lower Barton approximates to 

 that measured at Highcliff, and the beds yielded a considerable 

 fauna, though nearly all the species collected also range up into the 

 Middle division. The Nummidites-elegans zone, taken as the base, 

 is very distinct and the fossils in good preservation. It is 13 inches 

 thick, and contains the following fossils : — 



Typhis pungens. 

 Fusus pyrus. 

 Bucciaum Solan dri. 

 Pleurotoma exorta. 

 Voluta luctatrix. 



scabricula. 



Mitra parva. 

 Trochita aperta. 



Dentalium striatum. 

 Bulla, sp. 

 Corbula pisum. 

 Crassatella sulcata. 

 Nemocardium turgidum. 

 Leda minima. 

 Ostrea plicata. 

 Nummulites elegans. 



There is scarcely any lithological change in the beds as they pass 

 into the Bracklesham, and the first break occurs at the bed of sand- 

 stone 90 feet lower down. 



The Bracklesham, Sttjbbington, and Huntingbridge Sections. 



The highest bed that can be identified at Selsey is the Nummu- 

 lites-variolarius bed, locally known as the " Clibs." Higher 

 beds certainly exist, but there is no record of their having been 

 seen by any geologist. The transition in the fauna seems to com- 

 mence in the ^'Cyprcea bed" of Dixon, in which a large propor- 

 tion of Barton species occur, such as Cassidaria nodosa, Triton 

 argutus, Pleurotoma inarata, Fusus jjyrus^ Rimella rimosa, Littorina 

 sulcata, Voluta athleta, Y. scahricida, &c. With these are Conus 

 diadema, Cyprcea BowerhanJcn, and Pleurotoma attenuata. The bed is 

 remarkable as being fairly studded with the remains of Posidonia, a 

 marine Monocotyledon which rooted in the sand. This is valuable 

 as an indication of depth ; for the existing Mediterranean species, 

 hardly distinguishable from it, grows in the has-fonds in from 10 to 

 20 feet of water. Above this is the " Hard Bed," in which Tellina 



