Maple tree in limestone pavement, with glacial erratics
A perfect field maple (Acer campestre) tree growing in limestone pavement and surrounded by glacial erratic boulders at Holme Park Fell, South Cumbria.
On Farleton Knott and Holme Park Fell, the erratic boulders are of the same material as the limestone pavements on which they sit. They were transported from a neighbouring outcrop by a glacier during the last Ice Age, smoothed and rounded by the ice before being deposited atop this limestone pavement.
Limestone pavements were formed during the last Ice Age in the Pleistocene period when moving glaciers scoured bare the surface of the underlying limestone bedrock. The classic pattern of clints (blocks) and grikes (fissures) was produced by the erosive action of overlying soil - such as the moraine deposited by the glacier - and the rainwater that permeated it, enlarging the natural faults in the limestone rock.
(One of a pair of images in this gallery).
Date taken: 26 September 2014.