The writer of this article was lucky enough to find last August a large ovate implement of the Early Palæolithic period in Yorkshire, after many years of careful searching; he is indebted to Mr. E. T. Lingwood for the drawings of the same, for which help he offers his grateful thanks.

The site of this find is Upper Nidderdale, just within the boundary of the West Riding. At the far end of the dale, and some six and a half miles from its source, the river Nidd, which up to this point has run due East, makes a bend, practically a. right angle, to the South.

Some three hundred yards below this point an interesting geological phenomenon occurs in the shape of a triangular fault with its apex to the South, which has thrust up the Carboniferous Limestone on both sides of the valley.

Through this the river, with the help of the glaciers, has cut its way.

This strip of limestone is about half a mile long and below this the river continues its course for some distance through the Millstone Grit series, Nidderdale being, from a geological point of view, a Millstone Grit dale.