part 4] BUNTEE PEBBLE-BEDS. 339 



most of the finer material Avas derived from the Millstone Grrit or 

 Coal-Measure sandstones o^ the neighbom-ing Pennine Range, the 

 existence of Avhich is indicated by the occurrence — between Dale in 

 Derbyshire and Lenton near Nottingham — of Bunter sandstone 

 banked against cliffs of Coal-Measure sandstone that were sub- 

 jected to atmospheric weathering at that time. An examination of 

 the heavy minerals of these rocks should throw considerable light 

 upon the origin of the Bunter. 



Mr! W. H. Booth stated that a boring made at Farnsfield, some 

 twentj-two years ago, entered the Waterstones, and the water-level 

 was within a few feet of the surface, the rocks being therefore 

 fully submerged. A little later, a deep borehole was put down at 

 Newark-on -Trent at Messrs. Hole & Company's brewer}^ It was 

 taken to about 800 feet by the Diamond Boring Company, and the 

 water rose to 50 feet above the surface. If still in existence, the 

 sample-box of the Farnsfield core would be in the hands of the con- 

 tractors, Messrs. Le Grand & Sutcliff. 



Dr. Herbert H. Thomas, in reply, thought that there was 

 great difficulty in ascribing a local origin to much of the Triassic 

 material. The presence of staurolite in such great abundance was 

 difficult to explain on that hypothesis, and he considered it even 

 more dangerous to speculate on the natui-e of rocks completely 

 hidden by the Trias, than to point to areas known to be capable of 

 supplying material similar to that of which the Triassic rocks are 

 composed. * 



He expressed the opinion that certain minerals mentioned by 

 the Author, more especially the staurolite, had been derived 

 directly from metamorphic rocks, and had not before entered into 

 the composition of a detrital rock. 



He felt sure that the Author, if he had been present, would have 

 been pleased with the reception accorded to the paper, and with the 

 interesting discussion to which it had given rise. 



[Deceml)er 31st, 1918.] 

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