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Rh Brick-kiln Farm. Except that the surface has undergone more decomposition than is usual with flakes of the Neolithic Period, and that it bears upon it some of those bright shining specks, so common on flints from the gravel, there is nothing to distinguish it from one of much more modern date. These bright or polished spots, which are very minute, seem to indicate points of contact with other stones, and the lustre upon them is probably due in part to pressure and in part to friction. They are most apparent on dark-coloured flint, and afford one of the tests of the authenticity of a worked flint professing to belong to the River-drift Period.

Fig. 442.—Gravel Hill, Brandon.

One of the most interesting features at Gravel Hill is that there, for the first time, were found cutting stone implements of the Palæolithic Period formed of other materials than flint, chert, or quartzite. That shown in Fig. 442, though so identical in form with many of the