116 



GEOLOGY OF THE ISLE OF WIGHT. 



Dentalium, sp. 

 Cardium parile. 

 Cardita. sp. 



Tellina filosa ? 

 Braiideri? 



Ft. In. 



sp. 



Area aviculina. 



Dark sandy clay, containing a bed of septaria 

 Indurated, greyish, sandy clay, with impressions of fossils 



Fusus undosus ? 

 Voluta nodosa. 

 Natica, sp. 

 Phorus agglutinans 

 Turritella sulcifera. 

 Dentalium, sp. 

 Teredo, sp. 

 Pecten come us. 

 Cardium parile. 

 sp. 



Cardita, "A sp. 

 Cytherea obliqua. 



■ suberycinoides. 



lucida. 



Tellina tumescens ? 



2 sp. 



Sanguinolaria HoUowaysii. 

 Panopsea corrugata. 

 Leda, sp. 

 Modiola (or Mytilus) sp. 



weathering greenish grey, containing 



Dark sandy clay, 

 bands of lignite* 



Conglomerate of flint-pebbles, cemented by iron -oxide. 

 The pebbles are of various sizes, up to a foot in 

 diameter --.-.. 



Sands (principally white), light tawny-yellov,' in the upper 

 part ; the lower 3 feet crimson - - . - 



Whitish marly clay - . ■ . - 



Dark chocolate-coloured marls and carbonaceous clay," 

 with much lignite and selenite. 



Ft. In 

 Clays and marls 

 Lignite band 

 Clays and marls 

 Lignite band 

 Clays and marls 

 Lignite band 

 Clays and marls 

 Lignite band 

 Clays and marls 



Total thickness of the Bracklesham Beds 



11 







16 



1 to 1 6 



45 

 25 



39 6 



155 



Whether the lower part of this section really belongs to the 

 Bracklesham Beds is doubtful. Mr. Fisher takes as the base of 

 the Bracklesham Beds at Alum Bay the bed of flint pebbles 

 formerly adopted by the Survey as the base of the Barton Clay. 

 He therefore places the pebble beds at WhiteclifF and Alum Bays 

 approximately on the same horizon. The pebble bed at Alum 

 Bay certainly appears to mark the incoming of marine conditions, 

 after the deposition of the plant-bearing sands and pipe-clays of 

 the Lower Bagshot Beds. But in the absence of recognizable 

 fossils throughout the whole of the next 500 feet of strata, it is 

 possible that we are merely dealing with decalcified equivalents 

 of the marine beds o£ Whitecliff Bay and Bracklesham. The 

 pebble bed at Alum Bay may therefore really belong to the 



* This is the lowest bed attributed to the Bracklesham Scries in Mr. Fisher's 

 section. 



