This paper, which is but a brief epitome of my investigations, may be considered as a supplement to the valuable one by Col. Lane Fox “On the Palæolithic Implements in Association with Elephas primigenius in the Thames Valley at Acton”, so far as it relates to much higher bench-deposits than those described by him. Mr. Whitaker has described the highest of the three terraces into which he has divided the valley-deposits, as occupying the levels between 50 and 100 ft. above O. D., and extending up the shoulders of the hills which, to the north of the river, divide the inner valley from its wider extension of, generally speaking, low-lying Eocene deposits, now bounded by the chalk hills of Herts and Bucks. I shall now show that the high bench-deposits reach far above the 100-foot level; this fact is, however, one which Mr. Whitaker is evidently prepared for. The high-valley gravels proper in the neighbourhood of Ealing flank the sides and, in some cases, reach nearly to the top of the hills which form the inner-valley ridge. They extend from East Acton (where the mid terrace runs up as a deposit which differs altogether in structure from the higher one, and which appears to be a redeposit of the older bed) to beyond Hayes, forming a continuous tract to the north, which reaches much beyond the Great Western Railway. The highest ground of the inner-valley ridge above mentioned is at the Mount and Hanger Hill; the former, which rises to 204 ft.