CHAP, vi.] RELATIONS OF MID PLEISTOCENE STRATA. 



141 



Thames at Crayford and Erith, as may be seen from the 

 examination of Fig. 31. In this locality, in bed No. 

 5 at Erith, there is unmistakable proof of the action of 

 ice in an angular lump of clay torn from the Eocene 



rr'== . ^F= ^==ul=i=^ : =. ==. 6. Surfaces of rainwash, 2 



4. Sharp sand and gravel, 

 with CorUcula jlumi- 

 nalis, 4 feet. 



3. Brick-earths, with, mam- 

 mals, 12 feet 



2. Black flint gravel, 3 feet 

 (musk sheep). 



- 1. Brick-earths, 6 feet. 



ms^^^i^M/Mmmfffiii 



FIG. 31. Lower Brick-earths of Stoneham's Pit, Crayford. 



beds, which had evidently been deposited while it was 

 frozen, since it had suffered no abrasion in the course of 

 its transport, more than 150 yards from the Eocene strata 

 then forming the banks of the ancient Thames at this 

 point. 



It seems to me very probable that " the trail," which 

 undoubtedly has been accumulated under severe climatal 

 conditions, may be the equivalent of the boulder clays 

 found on the northern side of the lower Thames in Essex 

 and Hertfordshire. In that case the remains of man and 



