132 



GEOLOGY OF THE ISLE OF WIGHT. 



Middle Headon 

 Beds, 30 feet 

 4 inches. 



Rather compact pale greenish-yellow sand, 

 without fossils - - - _ - 



Verdigi'is-green clayey beds, abounding in 

 Cyrena obovata, Ostrea, Melania muri- 

 cata, Cerithium concavum, Naiica - 



Band of ferruginous concretions, often cal- 

 careous internally. Small Nematura or 

 Hydrobia, Neritina (rare), Cerithium 

 jjseudo-cinctum, Melania muricata, Cyrena 

 obovata, Modiola, Ostrea (rare) 3 inches to 



Bluish-green clays, often very fossiliferous. 

 Cyrena at the top of the bed, and Ostrea 

 in lenticular patches in the lower part, 

 which becomes blacker and contains cal- 

 careous nodules. Cyrena obovata, Mytilus 

 affinis, Cerithium pseudo-cinctum, Neritina 



3 feet to 



Lignite and clay; sand in places. Nume- 

 rous bands of Potamomya near the base. 

 Cerithium pseudo-cinctum, Neritina, Mela- 

 nojjsis . _ - - - 



'* Venus Bed." Brownish clay full of 

 marine shells. Bank of oysters varying 

 in thickness in different places. Ostrea 

 velata, Cytherea incrassata, Corbula 

 cuspidata, Cerithium, pseudo-cinctum, Fusus, 

 Murex, Voluta spinosa, Cancellaria, 2 sp., 

 Pleurotoma, 2 si)., Nucula headonensis, Area, 

 Natica, 3 sp., Bulla, 2 sp., Tellina, 2 sp. 

 (The Oyster Bed rises a little (15 feet) 

 south of Linstone Chine) - - - 



Very variable alternations of blue and red 

 clays and yellow and white sands, becoming 

 fossiliferous, especially near the base, and 

 with a ferruginous band 4^ inches thick in 

 the centre. Ostrea, Melania muricata, 

 Cerithium pseudo-cinctum, &c. 



" Neritina Bed." Dark-blue sandy clay, 

 with two well-marked bands of Cyrena. 

 Cyrena obovata, Cerithium, 3 sp., Neritina 

 concava, Melanopsis fusiformis, Nematura, 

 Chara . . . - - 



"Whitish sandy clay with crushed Limneea 



Limestone. Limneea longiscata, L. pyrami- 

 dalis, L. gibbosula, L. minima, Planorbis 

 euomphalus, P. rotundatus, P. obtusus ?, P. 

 platy stoma, P. lens, Paludina (rare), Chara. 

 (This limestone forms How Ledge) 



Whitish and grey calcareous clay, passing 

 into Limestone with thick bands of crushed 

 Limnaa and lignite near the top and scat- 

 tered Paludina below. Turtle bones 



Blue soft sandy clay, with bands of Paludina, 

 small black seeds, and Unio Solandri 



Pur])]ish-grey carbonaceous laminae with 

 oblique root like markings. Bands of 

 Paludina, Melania, Cyrena, Unio, Seeds - 



Brown, red, and grey clays and sands, with 

 scams of Paludina. Paler sands below 



Sand, abounding with small shells above, and 

 with a concretionaiy liand at the base. 

 Helix labyrinthica, Achatina costelluta, 

 lAmntea pyramidalis, L. caudata, h. 



Ft. In. 



2 



3 

 1 



6 



2 



9 



6 



2 4 

 2 3 



2 



