The particular area dealt with in this paper is the extreme S.W. corner of the County, embracing roughly a triangle having its base of 14 miles along the high moors W. of Sheffield, viz., from Langsett (N.) to Fox House (S.), the apex at Mexboro', and the ridges on the right of the Don Valley forming one side.

From its varied character, including as it does the extremes of bleak upland impossible of cultivation, and sheltered valley and lowland, it is in many respects an ideal area for study.

Unfortunately, flint, for reasons explained later, is scarce, hence it is only by the cumulative results of patient search extending over a period of years that any conclusion can be arrived at touching the culture of the implements found.

The base-line of the area under consideration follows in general the Yorkshire–Derbyshire boundary, and traverses a wide moorland country of considerable altitude, consisting of glacier-sculptured heights, seamed with deep, frequently precipitous ravines.