lo6 Sir H. C. Enolefislo's Obfervations 



The height of Diinnofe is 800 feet above low water mark. St. 

 Cathennfc's''hill is at leaft 850. Of the former I had no oppor- 

 tuniry of examining accurately the thicknefs of the ftrata; but at 

 S:. Catherine's the ftrata are as follow : 



Chalk - 250 f^et 



Stone - 200 feet or perhaps not quite fo much. 



Clay and fand 400 feet 



850 



This arrangement accounts entirely for the formation of that 

 fmgular coaft called the UnderclifF, which extends from Dunnofe 

 to St. Catherine's, and is compofed of the confufed fragments ot the 

 upper ftratum of rock which have given way and rolled down as the 

 fubftratum of clay has been walhed away by the fea. In mpftp;u-ts 

 the procefs feems nearly at a ftand ; the coaft being now protefted 

 by the fallen rocks; but at St. Catherine's great devaftation is Oill 

 taking place. The earth-fall mentioned laft year was a very fmall 

 operation of this kind when compared with the relicks of former 

 convulfionsi 



From this (hort (ketch of the general pofition of the ftrata in the 

 iftand, I return to the particular fubjeft of the prefent jiaper. 



The chalk pit, which I am about to defcrihc, is fituated on the 

 northern edge of the chalk range juft out of the village of Carif^ 

 brook, and about an hundred yards beyond the divjfion of the roada 

 to Yarmouth and Shorwell. The pit is open to the eaft. 1 he 

 ftrata of chalk are very regular, from two to five feet in thicknefs, and 

 divided by feams of flint from fix inches to nine inches in depth. 

 The flints are, as ufunl, in noduks of different fizes, from the fize of 

 the fifl: to twice the fize of » man's head. The whole dip north- 

 ward with an inclination of at lead 67 degrees. Perpendicular 

 filTures run through the whole from north to fouth, the fides of 



which 



