LOWER GKEENSAND. 



33 



Chalybeate Spa, Shanklin Esplanade. 

 Chemical Composition. Combined as follows 



The horizontality of the beds (excepting in a very gentle anticline 

 south of Little Stairs fault) is maintained as far as Shanklin Chine. 

 Here a south-south-westerly dip sets in, winch gradually brings 

 the upper strata down to the beach in succession, the an^le of dip, 

 as calculated from the heights on the Ordnance Map, amounting 

 to 1 in 30, or a trifle less than 2°. 



The strata last described contain oolitic iron ore, and are 

 identified by Fitton with a part of his Group XIII. They sink 

 below the beach on the south of Shanklin Chine, and are 

 succeeded upwards at a few feet distance by a richly fossiliferous 

 bed, in which Fitton obtained Vermicularia, Serpula, Waldheimia. 

 {Terehratulu) pseudojurensis, Leym., T. sella, Sow., Rhynchonella 

 sulcata, Park. (T. multiformis, Fitton), Rhynchonella gihbsiana, 

 Sow. ( T. yibhsiana, Fitton), and Anomia, Exorjyra, Pecten, Lima, 

 &c. Ten feet and eighteen and a half feet higher up respectively 

 are two ranges of Exogyra sinuata, first discovered by Captain 

 Ibbetson."^ 



Next above these lies the sandstone which forms a reef called 

 Horseledge by Fitton, f and which yields ferruginous nodules 

 with Panopoea plicata. Sow., Trigonia alceformis. Park., Thetis 

 minor. Sow., Gervillia anceps, Desh., Terebratula sella, Sow., 

 Rostellaria robinaldina, D'Orb. This was said by Fitton to 

 resemble his Group XIV. 



A clay-band, 8 feet thick, which rises from the beach about 300 

 yards north of Luccomb Chine, corresponds to the thick clay 

 which lies next above the cascade in Blackgang Chine (the lower 

 part of Group XV. of Fitton). It makes a small undercliff or 

 ledge in the cliff, and crops out 300 yards south of Shanklin Chine, 

 whence it may be traced through the brick pit at Lower Hide, by 

 Apse Farm, to the brick pit, now disused, at Sandford. This 

 band forms the top of the Ferruginous Sands. 



* Rep. Brit. Assoc, for 1844 (Sections), p. 43. 



t This seems to be the reef marked Yellow Ledge on the Six-Inch Ordnance Map, 

 and is about 350 yards south of the reef marked as Horse Ledge. 



E 56786. ^ 



