120 GEOLOGY OF THE ISLE OF WIGHT. 



Ft. In. 



Lima, sp. Cypricardia, sp. 



Avicula media, Sow. Cardita oblonga, Sow. 



Area, sp. Cytherea tenuistriata, Sow. 



Pectunculus deletus, Brand. Tellina ambigua ? Sow. 



Limopsis scalaris, Sow. Corbula ficus P Brand. 



Nucula bisulcata, Sow. Panopsea intermedia, Sow. 



Chama squamosa, Brand. 



Cardium porulosum. Brand. Schizaster D'Urbani, Forbes. 



Lucina gibbosula. Lam. 



Crassatella tenuisulcata, Edw. Ditrupa plana, Sow. 



Imperfect ironstone band, not well seen - - - 3 



Grey and pale blue clays, with light fawn-coloured bands near 



the base - - - - - - - 36 



Stiff laminated clay, with occasionally dark patches. Few or 



no fossils - - - - - - -180 



Pale blue and yellow sandy clays, with very few and badly 



preserved fossils - - - - - .54 



Nummulites elegans zone, consisting of rather dark green and 



blue glauconitic sandy clays, much crowded in places with 



Nummulites elegans. Fossils : — - - - - 11 



Typhis pungens. Brand. Bulla, sp. 



Fusus bulbus, Brand. 



Cominella Solandri, Edw. Corbula pisum. Sow. 



Pleurotoma exorta. Brand. Crassatella sulcata, Brand. 



Voluta luctatrix. Brand, Cardium semigi'anulatum. Sow, 



digitalina, Lam. Leda minima, Sow. 



Mitra parva. Sow. Ostrea flabellula. Lam. 



Calyptreea trochiformis. Lam. 



Dentalium striatum. Sow. Nummulites elegans, Sow. 



Total - 162 1 



The Barton Clay of the Isle of Wight yields a fauna closely 

 corresponding to that of the typical locality on the opposite coast 

 of Hampshire, but at present the list of fossils is much smaller. 

 This is perhaps partly due to a greater poverty of the fauna, but 

 in all probability it mainly arises from the difficulty in following 

 thin fossiliferous seams where the beds are so much hidden by 

 landslips. Another reason is that the area over vi^hich each seam 

 can be examined is much less in the Isle of Wight than at Barton, 

 owing to the tilting of the beds and their rapid disappearance 

 beneath the sea-level. 



As in the Bracklesham Beds, the moUusca in the low^er part 

 of the Barton Clay of Alum Bay show a decidedly warm 

 climate, but the fossils are more exclusively marine, the beds 

 contain a smaller mixture of lignite, and show altogether less 

 sign of the proximity of land. Among the more conspicuous 

 fossils are Nummulites elegans, Pecten reconditus (Fig. 35), 

 Gorhula pisum, Crassatella sulcata (Fig. 29), Pectunculus deletus, 

 Psammobia compressa (Fig. 27), Galyptraa trochiformis (Fig. 33), 

 Conus dormitor (Fig. 32), Fusus longoRvus (Fig. 31), Fusus pyrus 

 (Fig. 26), Murex asper (Fig. 25), Phorus agglutinans (Fig. 24), 

 Rostelluria rimosa (Fig. 28), Typhis pungens (Fig. 34), Voluta 

 luctatrix (Fig. 30), &c. 



