370 GLACIAL DRIFTS. [1893. 



his non-uniformitarian belief, a profession of his geo- 

 logical creed. 



It may be remarked that while Prestwich had pub- 

 lished very fully his observations on the Tertiary forma- 

 tions and on the Quaternary strata, which immediately 

 preceded and succeeded the Glacial deposits, yet he 

 had not dealt in a similarly comprehensive manner with 

 his observations on the Glacial Drifts. It is true that 

 in many of his papers he had published sections of 

 Boulder Clay and Glacial Gravel, and he contributed 

 much information with respect to them. Nevertheless 

 his views generally on the formation of the Boulder Clays 

 and associated deposits were not given to the public 

 in the same exhaustive manner as were those dealing 

 with the Eocene and Oligocene strata, the Crag series, 

 the Westleton Beds, and the later Pleistocene accumula- 

 tions. His note-books show how he had followed the 

 Glacial Drifts far and wide, not only in the Southern 

 and Midland counties, but in Wales, in the north of 

 England, in Scotland and Ireland. Indications of his 

 views are given in the second volume of his great 

 treatise on * Geology/ wherein he remarks (p. 453) : 

 " Equally marvellous is the glaciation of the northern 

 counties of England. There also only a few of the 

 higher hills escaped the grasp of the great ice-sheet, 

 the marks of which are perceptible up to heights of 

 about 2500 feet in the Lake district. As the land- 

 ice travelled southward it became thinner, and its 

 traces are gradually lost. The Glacial Drift-beds die 

 out on the hills immediately north of London, whence 

 their boundary passes by Oxford to South Wales." 

 These views show how inclined he was to maintain 

 that the main mass of Boulder Clay was the product 



