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