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556 the spot to which the name of Whitehill has been given by Mr. Trigg. The gravel is composed of similar materials to that at Redhill, of which it may be said to form a continuation, except that the matrix is whiter. Mr. Trigg has informed me that beneath the gravel are beds of red sand, and that at one time, a section was exposed of 26 feet in depth. Of late, the gravel at this spot has been but little worked, and but few implements have been found in it.

Mr. Trigg records having obtained three flint implements from this place, one of which, at present in the Blackmore Museum at Salisbury, is engraved as Fig. 432. Its surface has become white and decomposed, and is partially covered by an incrustation of carbonate of lime. A part of the edge, towards the point, on the right side of the figure, appears to be worn away by use.

Remains of Elephas primigenius and horse have been found here, but no land or freshwater shells.

Between Whitehill and Santon Downham, but on the Suffolk slope of the valley, a considerable quantity of gravel has been dug on Thetford Warren. Though the gravel is of much the same character as at Redhill, no implements appear to have been found in it.

About three miles north-west of Thetford, and also on the Suffolk side of the Little Ouse, is Santon Downham Warren, on the slope of which towards the river, is a considerable expanse of gravelly beds, which have been largely excavated for road-making purposes. On the sketch map given by Mr. Flower, this place is erroneously called Whitehill. As has been already stated, the first implement from this spot was discovered by Mr. Trigg, when in my company, in 1865. Since that time, it has produced, at a moderate estimate, several hundred specimens, some of them affording the finest instances of the skill of the Palæolithic Period which have been found in Britain, or indeed elsewhere. The gravel is at a somewhat higher level above the river than that at Redhill, but resembles it in character. It contains, besides flints, a few of the quartzite pebbles of the New Red conglomerate, which have been derived from the Glacial beds and Boulder Clay which cap the chalk hills on either side of the river. The gravel is of considerable thickness, so much so that in places, caves of sufficient magnitude to allow of a man standing inside, have been formed within it, in consequence of the lower beds being let down into the