Old Cumbria Gazetteer - footbridge, Threlkeld


included in:-	geological walk, Blease Fell
	footbridge, Threlkeld
site name:-	Roughten Gill
civil parish:-	Threlkeld (formerly Cumberland)
county:-	Cumbria
locality type:-	footbridge
locality type:-	bridge
locality type:-	geological site
locality type:-	musical slab
locality type:-	clapper bridge
coordinates:-	NY29832760
1Km square:-	NY2927
10Km square:-	NY22

	BPC23.jpg (taken 22.4.2008) BPR33.jpg (taken 22.4.2008) BPC24.jpg The footbridge before unsympathetic conservation. (taken 22.4.2008)
	The Skiddaw Group mudstone at this location is completely metamorphosed by contact with the Skiddaw Granite intrusion nearby, hard and recrystalized as hornfels, spotted black with cordierite and with quartz. This is the famous musical stone from which a number of lithophones have been made.
	NB: beware my amateur geological knowledge.

	JandMN : 391 BXO32.jpg Rock, hand specimen of Skiddaw mudstone, moderately metamorphosed to slate with crystals of chiastolite, from Roughten Gill, Blease Fell, Threlkeld, Cumberland, NY29832730, 12 October 2012. Skiddaw group, mudstone; Ordovician, Llanvirn/Arenig. Chiastolite is a variety of andalusite, aluminium silicate, Al2SiO5. (taken 12.10.2012)

	JandMN : 390 BXO31.jpg Rock, hand specimen of Skiddaw mudstone, moderately metamorphosed to 'spotted' slate, from Roughten Gill, Blease Fell, Threlkeld, Cumberland, NY29832730, 12 October 2012. Skiddaw group, mudstone; Ordovician, Llanvirn/Arenig. (taken 12.10.2012)

	BPC26.jpg View of river. Looking down at the footbridge. (taken 22.4.2008)

	BPR32.jpg A musical stone; the NE slab, which rings musically if struck. (taken 22.4.2008) BPQ20.jpg Skiddaw granite from the stream bed, washed down from the intrusion higher up the fell. White crystals are feldspar; grey are quartz; black are biotite or hornblende. (taken 25.8.2008)

	BPR30.jpg The footbridge after unsympathetic conservation. (taken 26.9.2008) BPR31.jpg Dreadful conservation work on the southern half of the bridge. Plywood underneath, which is a short term material, and concrete pasted all over the place. The LDNP Authority are meant to be protecting our heritage not vandalising it; the excuse is to make it safer for cyclists, who need to walk over the bridge anyway. (taken 26.9.2008) BXM62.jpg The footbridge after unsympathetic conservation. (taken 12.10.2012)

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