| 词条 | Boxhead Pot |
| 释义 |
| name = Boxhead Pot | photo = Entrance to Boxhead Pot on Leck Fell in Lancashire.jpg | photo_caption =The Entrance to Boxhead Pot | location = Leck Fell, Lancashire, England | depth = {{convert|105|m}} | length = about {{convert|10|m}} | entrance_count = 1 | discovery = 1994 | geology = Carboniferous limestone | access = [https://web.archive.org/web/20130301014754/http://cncc.org.uk/leck_fell.html CNCC Permit] | grid_ref_UK = SD 67130 78337 | elevation = {{convert|360|m|ft}} | survey = cavemaps | map = United Kingdom Yorkshire Dales | map_width = 180 | coordinates = {{coord|54.199921|N|2.505855|W|format=dms|display=inline,title}} | hazards = verticality }}Boxhead Pot is a cave on Leck Fell, in Lancashire, England. It leads into the top end of Lost Johns' Cave, and is part of the Three Counties System, an {{convert|87|km|mi}} cave system which spans the borders of Cumbria, Lancashire, and North Yorkshire.[1] DescriptionThe entrance is in a deep shakehole {{convert|30|m}} south of Lost Pot. A vertical pipe leads directly onto the top of a {{convert|34|m}} shaft which lands on an unstable boulder ledge. Below that a {{convert|68|m|adj=on}} deep spacious shaft descends to the bottom of one of the two NPC Avens at the top end of Lost Johns' Cave (Lost Pot enters from the second aven).[2] Geology and HydrologyThe cave is a solutional cave formed in Visean Great Scar limestone from the Mississippian Series of the Carboniferous period. Its development has been largely determined by a vertical fault and a number of major joints. The streams that flow through the cave originate from small surface sinks, and are the main source of the water that flows through Lost Johns' Master Cave. It eventually emerges from the Leck Beck Head spring in Ease Gill.[3] The current outlet at the base of Boxhead Pot is small, but there are a series of abandoned phreatic passages, called the Tate Galleries, {{convert|10|m}} above the floor of the current outlet, and it is thought that the shafts were formed before the Devensian glaciation, and were originally drained by those passages.[4] HistoryThe Boxhead Pot shafts were originally climbed from below in the late 1980s by Mick Nunwick. In the autumn of 1994, Northern Cave Club cavers found an open and unstable hole in a shakehole, which they descended to land at the bottom of the NPC Avens in Lost Johns'. The cave was named after Alan Box, a club member who had died in a Spanish cave the previous year.[5] The entrance was stabilised in 1995.[6] References1. ^{{cite journal|last1=Allen|first1=Tim|title=The True Length Unravelled|journal=Descent|date=Feb–Mar 2012|issue=224|pages=24–25}} 2. ^{{cite journal |last1=Allen |first1=Tim |title=It's a Cracker |journal=Descent |date=Aug–Sep 2012 |issue=227 |pages=20–21}} 3. ^{{cite book|last1=Waltham|first1=A.C.|last2=Simms|first2=M.J.|last3=Farrant|first3=A.R.|last4=Goldie|first4=H.S.|title=Karst and Caves of Great Britain|date=1997|publisher=Chapman & Hall|location=London|isbn=0412788608|pages=30–34}} 4. ^{{cite book|last1=Waltham|first1=A.C.|title=Limestone and Caves of North-West England|date=1974|publisher=David & Charles |location=Newton Abbot|isbn=0715361813|pages=289–290}} 5. ^{{cite journal|last1=Monico|first1=Paul|title=New Lost John's Entrance|journal=Descent|date=Feb–Mar 1995|issue=122|page=14}} 6. ^{{cite journal|last1=Allen|first1=Tim|title=It's a Cracker|journal=Descent|date=Aug–Sep 2012|issue=227|pages=20–21}} 2 : Caves of Lancashire|Caves of the Three Counties System |
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