392 PHYSICAL HISTOEY OF THE BAGSHOT BEES OF THE LOKDOlf BASIjST. 



trial groups of strata (e. g. the Coal-lleasures and the lignitiferous 

 group of the Soissonnais) and in modern deltas. 



In many respects the criticisms on his section could only be 

 argued out on the ground. With respect to the clay-series spoken 

 of by Mr. Hudleston, no strong inferences could be drawn from that 

 on the opposite side of the area, even if it were shown to be Lower 

 Bagshot. He admitted that, in places, the Lower Bagshots become 

 more argillaceous, the London Clay having largely contributed to 

 the materials. 



