186 



GEOLOGY OF THE ISLE OF WIGHT. 



As the beds were evidently considerably thicker than had been 

 thought, they were re-measured during the summer of 1888. The 

 followino; section is the one then made : — 



Section of the Hamstead Beds at Hamstead. 

 (Measured by Clement Eeid and Henry Keeping.) 



Drift 



Upper 

 Hamstead 



Beds 

 (marine) 

 31i feet. 



Feet. 

 _/ Irregular clayey gravel of subangular flint, 

 ' \ flint and quartz pebbles, &c. - to 5 



f Pale bluish-green clay (much weathered), with 

 I seams of Oxtrea callifera bored by Lithodomus 

 I and overgrown by Balanus - - - 11 



1 Carbonaceous and ferruginous clays, full of 

 broken and watervvorn Cyrena semistriata, 

 Guma Charleswortliii and Voluta Rathieri 

 also occur occasionally - - -1 



Stiff blue clay, full of Corbula pisum, Cerithium 

 plicatum, G, elegans, Voluta Rathieri, and 

 Strebloceras cornuoides. A layer of flat 

 septaria about the middle - - - 7 



Black clay, full of Gorbula vectensis. Also 

 Gytherea Lyellii, Gyrena semistriata, Hydrobia 

 Ghasteli, Gerithium plicatum, G. elegans, 

 Melania fasciata, M. injiata - - - 4 



Shaly clays, with Gyrena semistriata, Cerithium 

 ■^ plicatum, Hydrobia Ghasteli, seam of Mya 

 minor. Occasional Paludina lenta and Unio 

 towards the base - - - - 4^ 



Shell-bed, full of Gerithium plicatum^ G. elegans, 

 Hydrobia Ghasteli, Melania injiata, and 

 Gyrena semistriata - - - - ^ 



Shaly clays. Seams of Paludina lenta and 

 Unio ------ 4 



Stiff Wue clay, carbonaceous at the base. 

 Scattered Cyrena semistriata. At base seams 

 of Mya minor, with Cerithium plicatum, 

 C. elegans, Hydrobia Ghasteli, Melania 

 injiata, Gorbula vectensis, Gyrena semistriata, 

 and Balanus - - - - - 1^ 



Laminated carbonaceous clay, and sand- 

 . partings with Cyclas - - - 1 



""Green clay, with Paludina • - - 3^ 



Carbonaceous clay, with Chara - ■ i 



Mottled red and green clay. Unio, Paludina, 



seeds, &c., occasionally - - - 11 



Obscure (mottled clays P) - - - 18 



Carbonaceous seams, with Carpolithes ovulum, 



Unio, and Paludina lenta - - - 2 



Carbonaceous clays, with seams oF Melania 

 injiata, var. lavis, Unio, Paludina, Planorbis, 

 Hydrobia Chasteli, and Seeds - - 15 



Bluish loam . « - - - i 



Clay, with Paludina, Seeds, &c. - - 3 



Obscure ...... 4 



Clays, with occasional Paludina and Melania, 



and seams of Carpolithes ovulum. Fossils rare 20 

 Obscure - .... 5 



Laminated carbonaceous clay, with Seeds, 

 Palm -leaves, leaves of Water-lily, Unio, 

 Paludina lenta, Melania, and Candona - IJ 



Green and red marls - - - - 8 



0])scurc (? s]iaringly fossiliferous) - - 60 



