404 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [A-pril 5, 



bottom, at one part, the thiu hard cream-coloured bed with green- 

 coated nodules. 



In a pit about two- thirds of a mile south-west of Brading church 

 the section is : — 



Nodular chalk, partly yellowish, weathering to a rough surface. 

 There is a line of whitish marl, srs or seven feet below which 

 comes a cream-coloured bed with a few green-coated nodules 

 (Chalk-rock ? — very badly marked). 

 Blocky bedded chalk with lines of marl. 

 At another pit near by, more than half a mile S.S.W. of Brading 

 church, the beds shown are : — 



Chalk with a few nodular flints (shown only at the northern 



end of the quarry, where it is 20 to 30 feet thick). 

 Thin seam of dark-grey clay. 

 Chalk, about 8 feet. 

 Inconstant layer of irregular-shaped green-coated nodules 



(Chalk-rock ?). 

 Evenly and massively bedded chalk, without flints, but with 

 seams of marl. 

 There is a smaller pit, just to the south, in the Chalk -marl. 

 Beyond this I have seen nothing of the hard nodular bed between. 

 the flinty and the flintless chalk. There seemed to be no trace of it 

 in the cliff" south of Bembridge Down, but it might perhaps be found by 

 a very careful search. The order of the beds here is as follows : — 

 White chalk with flints in layers, for the most part near together. 

 Bedded white chalk without flints, weathering to a rough surface. 

 Yery light grey chalk without flints. 



Chalk-marl, consisting of evenly bedded alternations of hghter- 

 coloured and harder, with darker, softer, and more clayey 

 beds ; passing down into 

 Upper Greensand : hard throughout, but the upper part more thinly 

 bedded and cherty, and therefore harder and weathering to a 

 rougher surface than the lower and lighter-coloured part. 

 The large and deep ditch of the fort on the top of Bembridge Down is 

 of course in the Chalk -with-flints, which dips northwards at a high 

 angle. At the northern side of the northern face, that is, where the 

 higher beds are cut into, there are fewflints, but layers of marl instead. 

 The great section of Culver Cliff shows something that must serve 

 as a caution against trusting too much in nodules ; for here, in the 

 midst of the Chalk with layers of flint at every three or four feet, is 

 a space some forty or fifty feet thick, with only one thin seam of 

 tabular flint, but with four lines of green-coated nodules, like those 

 of the Chalk-rock (which, if present here, must be hundreds of feet 

 below), but perhaps of a deeper colour. These seem to take the 

 place of the flints, the two not occurring together, and show that 

 like conditions must have held at different times during the deposi- 

 tion of the Chalk. My friend Prof. T. E. Jones drew my attention 

 to this bed some time ago. 



The relative position and thickness of the divisions of the Chalk 

 in the Isle of Wight are shown by fig. 4. 



