184?6.] PRESTWICH ON THE ISLE OF WIGHT TERTIARIES. 



255 



M a 

 3 <=> 



S o 



Description of Strata. 



laminated with yellow sand. A few subor- 

 dinate beds of impure greensand and seams 

 of iron-sandstone, and a few imperfect sep- 

 taria. At the bottom ten inches of flint 

 pebbles about the size of a swan's eggs. 

 Vegetable impressions. Few or no shells. 

 5. Broad striped sands of various shades 

 of yellow passing upwards into nearly white 

 sand. Two feet of iron-sandstone at the 

 bottom. 



4. Massive brown clay passing upwards 

 into dark clayey greensand, and then into 

 light greenish sand, separated from No. 3 

 by a layer of small flint pebbles in blackish 

 sand. Shells not abundant. Some septaria. 



.S. Grey and brown clay with some layers 

 of ironsand in one place ten feet thick ; 

 lower part more compact, clayey and of 

 brownish grey colour ; contains several 

 layers of septaria, with some iron pyrites 

 and rather numerous but very friable fos- 

 sils*. Ditrupa abounds 



2. Mottled, red, greenish, puce-coloured 

 and brown clay ; predominant colour red. 

 No fossils. Clay used for tiles. 



1. Yellow sand with flints ; not exposed; 

 thickness said to be two or three feet. 



u 



Feet. 

 1288 



95 



98 



75 



232? 



140 

 2 



1930 



Association of genera and 



characteristic species in the 



chief fossiliferous beds. 



4. 

 Pectunculus brevirostris. 

 Venericardia. 

 Panopaea intermedia. 

 Nucula. 

 Rostellaria. 

 Fusus. 

 Pholadomya raargari- 



tacea. 



3. 

 Dentalium (Ditrupa) 



planum. 



• Pentale, 



Venericardia. 

 Pecten } 

 Cytherea. 

 Turritella. 

 Ostrea flabellula. 



No animal remains dis- 

 covered. 



Chalk, in vertical beds. Many fossils, especially small corals. Strike S. 8° E. 



Fig. 2. Section exhibited at Alum Bay, on the North-western side of the 



Isle of Wight. 

 Gravel, consisting of rather angular chalk flints imbedded in a small quantity of 

 loose yellow sand — passes downwards into yellow and whitish sand with patches 

 and irregular layers of the same gravel. 



o 



^ o 



O 



05 w ;-i 

 S J3 « 



bj J2 « Ph 



« 1=1 •=! U 



75, 74. Whitish sand and thin calcareous 

 sandstone irregularly interstratified with a 

 few hard conglomerates. About ten feet 

 from the underlying clays occurs one foot 

 of brown clay and imperfect lignite, and one 

 foot of greenish marl with shells. 



73. Red clay mottled with yellow and 

 green coloured clay and marls and layers 

 of whitish sand. 



72. Greenish grey, brown, grey and yel- 

 low laminated sandy clays and marls : — in 

 the \ipper part numerous very imperfect 



40? 



20 



60 



75-72. 

 Paludina lenta. 

 Cyrena obovata. 

 C. cuneiformis. 

 Melania fasciata. 

 Potamides concavus. 

 P. ventricosus. 

 Turtle. 



* Prof. E. Forbes and Captain Ibbetson state that they have observed Ct/prinn plana /a 

 in these beds (3 & 4). 



VOL. II. — PART I. a 



