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chalk, through its erosion by water charged with carbonic acid. The same phenomenon has been observed at Bromehill, the spot next to be mentioned; and some connection was at one time supposed to exist between these cavities and the implements often found in and near them. I think, however, that the explanation^[1] that I have elsewhere given of their origin will be deemed satisfactory. No testaceous remains have been found here, and mammalian remains are very scarce.

Among the implements from Santon Downham, the almond-shaped^[2] type seems to predominate, though other forms are also found.

Fig. 433.—Santon Downham. 1/2

A very elegant pointed specimen, in my own collection, is shown in Fig. 433. It is chipped with great skill, and brought to a fine point, the butt-end being comparatively blunt, so that it may have been used in the hand without being in any way hafted. At the shoulder, shown in the side-view, a part of the original crust of the flint is left, and small portions are also left on the other face. In form, this implement curiously resembles some of those from Hoxne, and that from Gray's

1. See an article, "On some Cavities in the Gravel of the Little Ouse," Geol. Mag., vol. v. p. 443.
2. Franks, Proc. Soc. Ant., 2nd S., vol. iv. p. 124.