IS'te.] PRESTWICJH ON THE ISLE OF WIGHT TERTIARIES. 



253 



Description of Strata. 



e 



.s % 



c ^ 



O CO 



PS aj 



c a 







o 



^ 34. Hard liglit-coloured limestone with 

 numerous fossils. 



33. Dark grey marls passing upwards 

 into very light-coloured greenish white 

 marls. 



32. Light yellow earthy limestone — 

 lower part soft and porous, upper part 

 hard. 



31. Beds scarcely exposed, apparently 

 light green marls passing upwards into 

 laminated grey marls with a few shells*. 



30. Light yellow limestone. 



29. Indistinct. Apparently light green 

 marls, sometimes mottled with red, and 

 containing a few shells and nodules of fer- 

 ruginous clay. 



28. Alternating beds of striped hrown 

 clays and striped greenish grey marls with 

 a few layers of iron sandstone : shells nu- 

 merous but friable, and much broken. 



27. Striped ash-coloured and yellow 

 sand. 



26. Light green and grey marls, with a 

 few subordinate central layers of ash-co 

 loured and ochreous sands, — a few seams 

 of shells. 



25. Yellow and hght coloured sands. 



24. Alternating brown, grey and greenish 

 grey sandy clays and marls — in places full 

 of shells and small crystals of selenite — 

 passes upwards into a fine ash-coloured 

 sand with impressions of shells. 



23. White and ochreous sand. 



22. Compact thick-bedded light greenish 

 grey marly sand with light yellow and 

 brown partings — contains numerous tole- 

 rably firm casts and impressions of shells 

 very delicately marked, but no shell re- 

 maining. 



21. Light greenish marl with one bed of 



lignite, crystals of selenite, and numerous 



fossils — passes upwards into a laminated 



brown clay without shells, which again 



Lpasses upwards into 22. 



20. Ileadon Hill Sands. — Fine light yel- 

 low sand, with a few ochreous and ash-co- 

 loured bands : — passes upwards into a light 

 yellow sand with occasional tinges of red 

 colour, and in the upper part alternating 

 with beds of ironsand. It contains a thin 

 seam of small black flint pebbles, and no 

 fossils. 



Feet, 



110 



9 



5 



12 



80? 



40 



24 



7 



39 



36 



52 



202 

 751 



Association of genera and 



characteristic species in the 



chief fossiliferous beds. 



34-31. 

 Limnaea longiscata. 

 Planorbis euomphalus. 

 rotundatus. 



29-28. 

 Potamides cinctus. 

 Cyrena obovata. 



cuneiformis. 



Potamomya plana. 

 Paludina lenta. 

 Serpula tenuis. 

 Melanopsis. 



26. 

 Cyrena obovata. 

 Melania fasciata. 



24. 

 Fusus labiatus. 

 Ostrea flabellula. 

 Cytherea incrassata. 

 Potamides cinctus. 

 Melanopsis. 

 Neritina concava. 

 Melania fasciata. 

 Cyrena obovata (fre- 

 quently bored). 

 Natica. 

 Voluta. 

 Turritella. 

 Fishes, bones, and scales. 



21. 

 Terebellum. 

 Voluta spinosa. 

 Pleurotoma colon. 

 Ostrea flabellula. 

 Potamides cinctus. 

 Neritina concava. 

 Calyptrica. 

 Cytherea incrassata. 

 Vcnericardia. 

 Fusus labiatus. 

 Melania. 

 Paludina lenta. 

 Ostrea. 

 Planorbis. 



Bones and scales of fishes. 

 Dentaliiun cntale. 

 Cyrena obovata. 



* And Gyrogonites, found by Prof. E. Forbes and Captain Ibbetson. 

 t This division mav be above or below No. 20. 



