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Castle Rock (Edinburgh)

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(Redirected from Castle Rock, Edinburgh) Volcanic rock in Edinburgh, Scotland

Castle Rock
Castle Rock as seen from Princes Street
Highest point
Elevation140 m (460 ft)
Prominencec. 80 m (260 ft)
ListingTump
Coordinates55°56′55″N 03°12′03″W / 55.94861°N 3.20083°W / 55.94861; -3.20083
Geography
Castle Rock is located in EdinburghCastle RockCastle RockEdinburgh, ScotlandShow map of EdinburghCastle Rock is located in the City of Edinburgh council areaCastle RockCastle RockCastle Rock (the City of Edinburgh council area)Show map of the City of Edinburgh council areaCastle Rock is located in ScotlandCastle RockCastle RockCastle Rock (Scotland)Show map of Scotland
Topo mapOS Landranger 66
Geology
Rock age~350 million years
Mountain type(s)Crag and tail, volcanic plug
Climbing
First ascentUnknown

Castle Rock (Scottish Gaelic: Creag a' Chaisteil, Scottish Gaelic pronunciation: [ˈkʰʲɾʲekˈaˈxaʃtʰʲɪl]) is a volcanic plug in the middle of Edinburgh upon which Edinburgh Castle sits. The rock is estimated to have formed some 350 million years ago during the early Carboniferous period. It is the remains of a volcanic pipe which cut through the surrounding sedimentary rock, before cooling to form very hard dolerite, a coarser-grained equivalent of basalt. Subsequent glacial erosion was resisted more by the dolerite, which protected the softer rock to the east, leaving a crag and tail formation.

The summit of the castle rock is 130 m (430 ft) above sea level, with rocky cliffs to the south, west and north, rearing up to 80 m (260 ft) from the surrounding landscape. This means that the only readily accessible route to the castle lies to the east, where the ridge slopes more gently. The defensive advantage of such a site is clear, but the geology of the rock also presents difficulties, since basalt is an extremely poor aquifer. Providing water to the Upper Ward of the castle was problematic, and despite the sinking of a 28 m (92 ft) deep well, the water supply often ran out during drought or siege, for example during the Lang Siege of 1573.

References

  1. ^ MacIvor, Iain (1993). Edinburgh Castle. p. 16. ISBN 9780713472950.
  2. McAdam, David (2003). Edinburgh and West Lothian: A Landscape Fashioned by Geology. p. 16. ISBN 9781853973277.
  3. Dunbar, John G (1999). Scottish Royal Palaces: The Architecture of the Royal Residences During the Late Medieval and Early Renaissance Periods. p. 192. ISBN 9781862320420.
  4. Potter, Harry (2003). Edinburgh Under Siege: 1571-1573. p. 137. ISBN 9780752423326.

External links

Media related to Castle Rock, Edinburgh at Wikimedia Commons

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