200 GEOLOGY OF THE ISLE OF WIGHT. 



near Fullholding. Other borings (B.H. 290 and 291), a quarter of 

 a mile further north, showed grey clays, with Cyrena semistriata, 

 Melania muricata, and Cytheridea Muelleri — probably the Nematura 

 bed — and similar beds occur in the railway cutting near North 

 Park, and again north-east of Great Park. 



Near Alvington Farm the Hamstead Beds approach nearer to 

 the Chalk than anywhere else. A boring (B.H. 245), a quarter of 

 a mile north-west of the Farm, descended into the Nematura beds ; 

 so that the Black Band cannot be more than 27 chains from the 

 Downs, and the dip must be high. Due north of the ftirm a boring 

 (B.H. 244) seemed to reach the beds immediately above the Black 

 Band, while an adjoining one (B.H. 243) showed the green clays of 

 the Bembridge Series. 



This brings us to the series of borings at Gunville already 

 described (p. 195). Passing these, the Black Band can be traced 

 towards Newport in several borings (B.H. 64, 66?, 69?, 70, 75), 

 the first of which showed small angular flints in the carbonaceous 

 mud. The bed of Cyrena semistriata and Cytheridea 3Iuelleri 

 occurred in two borings (B.H. 60, 62) near Little Kitbridge, and 

 probably crops out also in the road-cutting between Newport and 

 Hunny Hill. 



In Newport itself there are no clear sections, but the Nematura 

 bed was well represented in a boring (B.H. 92) in the siding be- 

 tween the Station and the river. The fossils in this boring were 

 exceptionally numerous and well preserved, and seem to prove 

 that the strata containing them lie some distance up in the Ham- 

 stead Series and are equivalent to those found at the Cement 

 Works. Lithologlcally the black clay resembles the Black Band, 

 and like that bed, rests on a green clay with ' race' and root-like 

 markings. The well at Mew's brewery {see Appendix, p. 305) must 

 also have penetrated the lower part of the Hamstead Series, but 

 no samples of the beds above the Bembridge Limestone were 

 preserved. 



The only inland sections of the higher portion of Hamstead 

 Beds in the West Medina are borings ; there are no open pits, 

 and no samples have been preserved of the beds passed through in 

 wells. During 1887 Mr. Keeping sank a pit for the British 

 Association Committee in Parkhurst Forest, on the hill near 

 Marks Corner, but only found clays that probably lie about 25 

 feet below the marine beds. They yielded Paludina, fish, and small 

 globose fruits. 



Another pit on the Signal Hill showed mottled green clay, witk 

 Paludina, Planorbis, Unio, Cliara, and a fragment of Emys. 

 This Mr. Keeping took to correspond with the mottled bed about 

 15 feet below the Corhula beds.* As this pit is somewhat lower 

 than the highest boring made by the Survey (B.H, 11), which 

 seemed to be sunk in the clays immediately below the marine beds, 

 this correlation is probably right. 



On the southern end of the ridge above Northwood a trial 

 boring (B.H. 91) below Noke Farm showed beds that seemed to . 



* jRcport Brit. Assoc, for 1887, p. 414-423. 



