It is very likely that these channels were lateral channels, running along the side of the glacier in the valley and with the moorlands producing a barrier to the east. In addition to this the valleys in which the reservoirs now stand are deep and thin and are thought to be glacial melt water channels ie have been eroded by strong rivers flowing off, under or along the sides of glaciers as they melted and retreated. These are made from sediments deposited from beneath the glacier and shaped by the movement of ice. The hill just behind the white washed cottages on the other side of the pitch is a perfect example of a drumlin. Firstly you can see examples of drumlins, rounded hills, in the valley around White Coppice, which are a very typical feature of a glacial environment. The impact of this faulting and the resultant topology ie the highly erosion resistant Millstone Grit moors to the east, with some resistant bands of sandstones in the Chorley plain, has affected the impact of glaciation upon this area. To understand the juxtaposition of successively younger rocks at lower levels requires extensive faulting in the area, far more extensive than the fault in Dean Brook, dropping successively younger rocks down to the west/north west. Across the valley Healey Nab, which rises to only 200m is made from slightly younger Millstone Grit rocks (Rough Rock – approximately 313m years old) and then further west beyond that are the even younger Coal Measures that underlie most of the town of Chorley. These form the whole of the moorland to the east rising almost 250 meters above us on Great Hill and Black Hill. The moors to east are made up of Millstone Grits or more specifically the Fletcher Grits of the Namurian Stage (315m years old) of the Carboniferous era. ![]() ![]() However, there are two other geological phenomina, which I think are more impressive. In addition to quarrying the hardwaring gritstones, the faulting gave rise to a small amount of lead mining and even some other minerals. Thanks to the Forestry Commission for permission to set this cache.Head past the pavilion and through the gates over The Goit ie the man made water course which carries water down from more reservoirs further north via Brinscall towards the reservoirs at Rivington.īefore starting the walk there is an information board, which explains a little of the geology of the area and concentrates upon the fault that can be seen in Dean Brook, which comes off the moors almost opposite you. ![]() In the spring it is a blaze of colour with bluebells, wood anemone and wild garlic. Sallow Coppice may once have been dominated by willow trees and coppiced (the stems cut off regularly) to produce withies for fencing, hurdles or even coracle making! Today, the trees are mostly sweet chestnut, silver birch, wild cherry and sycamore. ![]() Over the stile and turn left through the mature woods. The cache is hidden at: N 52 26.087 + (2 * A) W 2 50.800 + (2 * A)ĭo not walk in a direct line to the cache because you will be confronted by a fence, so follow the footpath along the hedgeline to the corner of the field where there is a stile. You should only count the W's carved into the finger posts. Count the number of times the letter W is formally carved on the FINGER POSTS – (not the stile) count slowly and be sure to check all sides. The coordinates ARE NOT for the cache but for a signpost along the route to the cache. Out of hours on road parking is also available here. The car park is locked at 18:00 in summer and winter. The recommended Car Park is the Shropshire Hills Discovery Centre just off the A49 in Craven Arms.
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