132 A. J. JFKES-BEOWNE ON" THE BOITLDER-CLAYS OF LINCOLNSHIEE. 



Mr. C. Eeid replied that there were only fragments of shell iu the 

 Boulder-clay. 



Mr. Toplet remarked that differences in opinion on these theoretical 

 questions were naturally entertained by different members of the 

 Survey. He suggested that the differences between the Boulder- 

 clays on the two sides of the Chalk Wold might perhaps be explained 

 by the whole being formed by an ice-sheet coming from the north- 

 east, which carried Scandinavian rocks over the Xorth German plain, 

 and some as far as the English coast. 



The Atjthoe replied to Mr. Topley that brown clays were found on 

 both sides of the Chalk Wold, some of those on the west of the wold 

 being identical in character with the Hessle Clay, and such as could 

 not have been derived from the blue chalky clay by any process of 

 weathering. Some of what has been called Hessle Clay may have 

 been so derived from the Purple Clay. 



