LOWER GREENSAND. 



Z7Z 



ISLE OF WIGHT AND SOUTH-WESTERN COUNTIES. 



In the Isle of Wight the following divisions of the Lower Green- 

 sand, seen in succession between Atherfield Point and Rocken 

 End, were noted by Dr, Fitton : ^ — 



Shanklin 

 Sands. 



Walpen 

 Sands and 

 Crioceras 



Beds. 



Atherfield 

 Beds. 



(Variously coloured sands and clays ii8 



Upper clays and Sand-rock Il8 



Ferruginous sands of Blackgang Chine 20 



^Sands of Walpen and Blackgang Undercliff 97 



Laminated clay and sand 25 



Cliff-end sands, with concretions 20 



Upper Gryphjea (Exogyra) group, with Exogyra 



siniiata 16 



Walpen and Ladder sands 42 



Upper Crioceras group, sand with nodules and 



C. Brnverbankii 46 



Walpen clays and sands 57 



Lower Crioceras group, sand with nodules and 



C. Boiverbaiikii 16 



Scaphites group, brown sand with Ancyloceras {S.) 



Hillsii, A . gigcis 5° 



Lower Gryphisa (Exogyra) group, brown sand, with 



Exogyra siniiata 3 ^ 



r The ' Crackers,' sandy clay 85 



\ Atherfield clay 60 



\Feriia Mulleti Bed, sandy clay and sand 5 



808 10 



The ' Crackers ' bed contains two layers of ferruginous sandy nodules, so called 

 from the noise produced by the waves in dashing over the ledges formed by them 

 on the shore. 



The Lobster Clay of Atherfield occurs in the lower portion of the ' Crackers ' 

 division : it yields Astacus Vectensis and Meyeria magna. 



The Atherfield Clay is exposed also at Red Cliff, and the other divisions may 

 be seen in Sandown Bay. 



Punfield Beds. — Prof. J. W. Judd suggested in 1871 that a dis- 

 tinctive name, taken from Punfield Cove, on the north of Swanage 

 Bay, should be applied to certain strata previously grouped with 

 the upper part of the Wealden Beds and the base of the Lower 

 Greensand ; and he indicated the occurrence of these Punfield 

 Beds, not only in Dorsetshire, but in the Isle of Wight (see p. 364), 

 at Hythe, and perhaps also at Leith Hill.- 



The beds consist of an alternation of yellow sands and clays, 

 with limestones, marls, seams of " beef," and layers (made up of 

 small oysters) resembling the ' Cinder-bed ' of the Purbeck series. 

 Their fauna is brackish or fluvio-marine, hence they differ from the 



1 T. G. S. (2), iv. 195; Q. J. iii. 289 ; Mantell, Geol. Excursions Round the 

 Isle of Wight, edit. 3, 1854 ; Simms, Q. J. i. 77 ; Ibbetson and Forbes, Q. J. 

 i. 190 ; C. J. A. Meyer, G. JNIag. 1866, p. 15 ; H. W. Bristovv, Geol. I. of Wight, 

 p. 10. 



* Q.J. xxvii. 211. 



