142 GEOLOGY OF THE ISLE OF WIGHT. 



and teeth). Green sandy clays follow, Avith thin pyrltised bands 

 of shells, a band of LimncBo. longiscata and smaller subordinate 

 layers of Potamomua. 



Here the beds undulate, and towards the point above Norris 

 lower beds make their appearance. West of the Point green 

 clays are seen at the base of the cliff 4 inches thick, under a 

 2-inch band of clay-ironstone. These clays contain Melania 

 tvrritissima % and a black Cypris. Upon the clay-ironstone lies a 

 band of Cyrcna jmlclira followed by greenish clay 1 foot thick, 

 full of Cyrena ohovata, occasionally with the valves in contact, and 

 most numerous towards the upper part. Three feet beneath the 

 ironstone another similar band occurs, separated from the first by 

 green clays, with five or six bands of Potanwmya. Belovr the 

 second band of ironstone green clays, with Oysters succeed, 

 a!?sociated with Cyrena pulchra, C. obovata, Cc7'ithium, &c. 



On the shore, about 50 yards westward from the wall of Norris, 

 pyritiferous bands of Potamomya underlie the green clay with 

 oysters, and the section may be there continued as follows : — 



Ft. In. 



Green sandy clays, with an oyster-band 2 inches thick - - 1 6 



Grey sands, fossiliferous in the upper part, where they are also 



laminated, and passing into ferruginous grit - - -26 



Light-greyish clayey sands, with 2 inches of Potamomya in the 



upper part - - - - - - -4 



Beds not seen - - - - - - 3 or 4 



Greenish sands, with Melania muricata and Potamomya 



Greenish clay, with a few Potamomya - - - - 1 



Consolidated and partly pyritised bands of Potomomya, between 



which are layers of greenish sandy clay full of Char a, fish-scales, 



and Melania muricata in jjatches - - - - - 5 



Light-green sandy clay, with comminuted Cyrena - 



North of Norris, by the sea-wall, the beds on the shore at the 

 Point are crowded Avith Cyrena ohovata and Potamldes ; Cyrena 

 j)vlchra and oysters being somewhat scarce. 



The shells ah-eady noticed as being so plentiful on the beach 

 nearer East CoAves are probably derived from these beds, which 

 are most likely lower than those Avith consolidated bands described 

 in the preceding section. Opposite the Point they are probably 

 covered by the sea. Hence to the wall separating the Royal 

 o-rounds from those of Norris the strata are concealed ; but on 

 the shore opposite the latter, sands Avith Potamides, Cyrena, and 

 Oysters, again appear. 



East of Cowes and Newport there are no sections of the 

 Headon Beds till Whiteclifi" Bay is reached. However the trial 

 borings Nos. 116, ll7, and 118, about two miles east of NcAvport, 

 indicated freshwater beds belonging to the Headon Series, though 

 they yielded no characteristic fossils. 



At Whitecliff Bay the Headon Beds are 212 feet thick, and 

 are divisible, as in other parts of the island, into three sections — ■ 

 a middle marine, and an upper and a loAver freshwater and 

 estuarine. 



The following section is that measured during the original 

 Survey, Avith som.e corrections and additions made in 1888 : — 



