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Rh Mr. de B. Crawsliay has also found about 40 ovoid and pointed palæolitliic implements near Green Street Green.

The valley may be traced upwards for nearly five miles, in a south-easterly direction, to Currie Wood, between Knockholt and Shoreham; and on the border of this wood, not far from Currie Farm, I found on the surface of the ground, in 1869, a well-marked flint implement, in character and size closely resembling that from Swalecliffe, Fig. 462, and stained of a rich ochreous colour. In places there are some ferruginous concretions adhering to the surface, and it has all the appearance of having been derived from the gravel which here not unusually forms the superficial deposit. A part of one of the faces has been lost owing to a recent fracture, and it can be seen that the implement has been formed of what is now a light buff, somewhat chalcedonic, flint, similar in character to that of most of the pebbles in the gravel at Well Hill, near Chelsfield, about midway between Currie Wood and Green Street Green. A subsequent search on the spot, in company with Sir John Lubbock, Sir Joseph Prestwich, General Pitt Rivers, and Sir Wollaston Franks, was unproductive of any more specimens. The remarkable feature in the case is the elevation at which this implement was found, the level of the ground being probably 300 feet above the neighbouring valley of the Darent, and upwards of 500 feet above the sea. Regarding the gravel, however, as connected with the valley of the Cray, and not with that of the Darent, its elevation above the head of the valley is but slight. In 1872 I remarked that it was "necessary that further discoveries should be made in this district, before it will be safe to speculate on the origin of these gravels, and their relation to the superficial configuration of the neighbourhood." Since then, as will be seen in subsequent pages, these discoveries have been made.

Farther down the valley of the Cray than Green Street Green, near Dartford Heath, about half a mile to the south of Crayford Station, Mr. Flaxman C. J. Spurrell, F.G.S., has been so fortunate as to discover, in situ, the beautifully symmetrical implement which, through his kindness, I am enabled to engrave as Fig. 456.

It is of dark, brownish grey flint, in places mottled with white. It is worked to an edge all round, but is less sharp towards the base than towards the point. On one side, near the point, the edge