On the Glacial Phenomena of the Yorkshire Uplands

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Abstract
The Carboniferous hills that form the central axis and backbone of Northern England sink beneath the Triassic plain near the town of Derby. Between Derby in the south and Wensleydale in the north, this line of hills is broken through by the valleys of the Wye, in Derbyshire, and of the Calder and the Aire, in Yorkshire. In Derbyshire and the part of Yorkshire south of the Aire basin, no glacial drift has been found on the eastern slope of the chain, save where the latter is broken through by the above-named valleys. Thus in Derbyshire plenty of drift occurs in the valley of the Wye and in that of the Derwent below its junction with the Wye, as if some of the drift that is so plentiful on the western slope of the Pennine chain had come eastward through the Wye valley; but north of the Wye none is found in Derbyshire on the eastern slope of the china. Again, some boulders of transported rocks, granite, and other foreigners are said to have been found in the bed of Calder; but no drift-deposits have been found in the Calder basin east of the anticlinal axis, save one patch of Boulder-clay at Mixenden, some miles above Halifax, quite at the edge of the driftless area. The boulders above mentioned would seem to have been washed out of the drift of Lancashire. On the other hand, the western slope of the Pennine range is everywhere thickly covered with drift nearly up

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