Page:The Ancient Stone Implements (1897).djvu/707

Rh by Mr. Clement Reid, by means of grants from the British Association and the Royal Society; and the views that I expressed in 1872 have been in the main corroborated. The deposits are proved to be distinctly more recent than the Chalky Boulder Clay of the district, and there is evidence of oscillations in climate since the valley was formed in which the lacustrine beds were laid down, and before any Palæolithic implements or the brick- earth containing them had been deposited.

The beds at High Lodge, near Mildenhall, are of somewhat similar character to those at Hoxne, though occupying a depression on the slope of a hill, instead of a trough on the summit; and were probably deposited under nearly the same circumstances, though as yet no testaceous remains have been found in them.

Turning south, to the valley of the Thames, we find the gravel-beds at Acton and Ealing, though occasionally at a higher level, forming a terrace 80 or 90 feet above Ordnance Datum, along the side of the broad valley, at a height of some 50 feet above the general surface of the valley. In the bottom of this are spread out other beds of gravel, sand, and brick-earth, exactly as might be expected on the river-hypothesis; while at Highbury New Park, and Hackney Down, we have beds of the same character, which contain land and freshwater shells and flint implements, at a height, in some cases, of 100 feet above Ordnance Datum. The presence of these beds in such a position, consisting, as they do at Highbury, of sand and brick-earth, such as can only have been deposited in comparatively tranquil water, involves the necessity either of a large lake having existed at the spot, or of its having been within access of the flood-waters of the river. But either of these conditions is impossible, unless we are to suppose that the lower part of valley of the Thames, in which London now stands, was at that time non-existent. It must, therefore, have been subsequently excavated. But again, at lower levels at Hackney Down, and in Gray's Inn Lane, we have gravels of a more distinctly fluviatile character, and also containing palæolithic implements. The existence, character, and position of all these beds is, therefore, perfectly in accordance with the theory of the excavation of the valley by the river, and it is extremely difficult, if not impossible, to account for them satisfactorily in any other manner.

At Hitchin beds of much the same character occur, which there also are newer than the Boulder Clay of the district.