Geology
The sloping plateau summit of Pendle Hill is formed from the Pendle Grit, a coarse Carboniferous age sandstone assigned to the Millstone Grit Group. It overlies a thick sequence of Carboniferous Limestone beds.
Much of the lower slopes is mantled by thick deposits of glacial till or boulder clay dating from the last Ice Age. The historic decomposition of sphagnum moss on the hill has led to it being covered in peat.
The steep slopes of its eastern and southern flanks have given rise to a series of landslips.
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