Dr. FiTTON on the Strata below the Chalk. 191 



I did not find among the strata any one containing Paludina vivipara ; but on the beach weve 

 several loose blocks containing that fossil, with Ci/pris Valdensis, and not distinguishable from the 

 stone of Bethersden in Kent, — the " Sussex Marble." 



About 1800 paces from the Lower green-sand, a large block of sand-rock on the shore had the 

 waved surface, or ripple mark, which is common throughout the upper part of the Hastings sands : 

 and here the alternations of greenish grey sand and sandy clay, so frequently mentioned above, 

 are again very conspicuous. 



About 1950, was a mass of indurated clay iron ore attached to a nodular portion of hard siliceous 

 grit, containing moulds of large Paludina, filled with sparry sulphate of barytes : a fact which 

 accords with the supposed continuity of deposition of the Weald-clay and the Lower green-sand; 

 sulphate of barytes being found, it will be remembered, in the fuller's- earth of Nutfield, at the 

 bottom of the latter formation*. 



About 2040, are strong beds of sand-rock including concretions of hard grit ; and thence 

 westward the entire cliff is composed of reddish clay and sand. From this part of the series, 

 which seems to correspond to the strata near Brook Point, on the south-west coast of the island, 

 it is probable that the remains of the Iguanodon have been derived, of which Dr. Buckland has 

 given an account in a paper read before the Geological Society f : and near the same place beds arise 

 of purplish red and variegated clay, alternating with fuller's-earth of a clear bluish green colour, 

 mixed with cohesive sand. 



(99.) Strata from Bonchurch Cove to the middle of Sandottn Bay. 



The direction of the coast on the south of Sandown Bay^ from the Fort to 

 the south of Dunnosej;, is about 15° west of south. But on rounding that 

 promontory the direction changes^ and the general trend of the coast thence to 

 Rocken Endj is towards a point between 15° and 17° south of west, which 

 seems to be generally the strike in the southern portion of the island; the 

 dip being south 17° east. 



The summit of the Downs here consists of Chalk, with the Upper green-sand beneath; and the 

 subsidence of the Gault has produced very extensive ruin, especially at East End and thence to 

 Luccombe ; the debris there affording numerous fossils, among which were the following : — Am- 

 monites Rhotomagensis , A. Seliguinus, A. varians, Gryplicea vesiculosa, Inoceramus tenuis, Mya 

 mandihula, Ostrea spinosa, Pecten orbicularis, Serpulse, Vermetus Polygonalis. 



The Lower green-sand rises a little on the west of the streamlet at Bonchurch-Cove, and the 

 following subdivisions, though in a great measure arbitrary, will give a general notion of its com- 

 position. 



* Sulphate of barytes has been found also in the Upper green-sand at Worbarrow Bay, Dorset- 

 shire. 



f Proceedings, vol. i. p. 159 : and Geol. Trans. 2nd Series, vol. iii. p. 421. 



J The names of the headlands in the Ordnance Map of this part of the coast, are different from 

 those of the Admiralty chart and of Mr. Webster's map of the island. In the former, the height 

 between Luccombe and Shanklin Chines is called Dunnose ; and the greater promontory between 

 Luccombe and Bonchurch-Cove, (which in the other maps, above mentioned, is named Dunnose,) is 

 called Chine-head. I have adopted the position assigned to Dunnose in the Admiralty chart. The 

 top of Shanklin Dorvn, (which is not very diflerent from the general level of the Chalk Downs 

 hereabouts) is according to the-X)rdnance Survey, 792 feet above the sea. 



VOL. IV. — SECOND SERIES. 2 C 



