86 HOLMFIRTH FLOOD. [1851-52. 



is an intermediate section of great interest at Upnor, near 

 Eochester, which we might easily visit by means of a return day 

 ticket on the North Kent line ; or, if you prefer, we can take a 

 day ticket to Maidstone, and examine the Drift and Greensands. 

 With regard to the Reculvers and Sandwich, I will give you full 

 particulars of the best localities and points, and mark them on 

 the Ordnance Map, in case you wish to visit them on your way 

 to Belgium. I forgot to mention the Abbey Wood cutting. It 

 is very interesting. The other section, however, which I men- 

 tioned, on Plumstead Heath, shows the same phenomena. I arn 

 not going beyond this town. To-morrow I hope to spend in the 

 Isle of Purbeck, and expect to be in London on Tuesday. I shall 

 not, therefore, fail to be present at the next meeting, when I 

 shall be happy to arrange the excursion in any way that may be 

 most agreeable to you, and remain, my dear sir, yours very 

 truly, J. PRESTWICH. 



The date of publication of his paper " On the Drift 

 at Sangatte Cliff, near Calais," was 1851, while that 

 "On some of the Effects of the Holmfirth Flood" 

 was published in the volume of the Geological Society 

 for 1852. Reference is made to the latter in the 

 following note : 



J. Prestwich to W. Cunnington. DERBY, 8th March 1852. 



DEAR CUNNINGTON, ... I went from Huddersfield to 

 Holmfirth and then on to the Bilberry reservoir. The effects of 

 the flood were most remarkable. The valley was in many places 

 literally strewed with debris of sand, gravel, and rock, 1 to 6 

 feet thick. Transported blocks of 2 to 5 feet were common. 

 One huge fellow measured 22 feet by 6 and 2J deep. Talk of 

 glaciers ! it would have taken one fifty years to have done what 

 this water-power did in an hour. Yours very truly, 



J. PEESTWICH. 



The third of Prestwich's great Tertiary memoirs was 

 likewise published in the Geological Society's Journal 



