High Crag (Helvellyn)

High Crag
High Crag seen from Dollywaggon Pike,with Nethermost Pike beyond
Highest point
Elevation884 m (2,900 ft)
Prominence13 m (43 ft)
Parent peakNethermost Pike
ListingBirkett
Coordinates54°30′50″N3°00′57″W / 北緯54.514度、西経3.0158度 / 54.514; -3.0158
Geography
ハイ・クラッグは湖水地方にあります
ハイ・クラッグ
High Crag
Location in Lake District, UK
LocationCumbria, England
Parent rangeLake District, Eastern Fells
OS gridNY343136
Topo mapOSLandranger 90, Explorer OL5/OL4

High Crag is a minor fell on the Helvellyn Range in the eastern region of the EnglishLake District. It sits on the ridge to the south of Helvellyn and Nethermost Pike. It rises sharply above the head of Ruthwaite Cove, and has attracted the attention of rock climbers. Its rock type is a lapilli tuff of the Helvellyn Tuff Formation.

Topography

High Crag seen from Ruthwaite Cove

High Crag is a rocky crag, over 100 m high, which rises abruptly above the head of Ruthwaite Cove (/ˈrʌθət/)[1] and which forms a minor fell on the south ridge of Nethermost Pike, at a point some 350 m north of the col between that mountain and Dollywaggon Pike.[2]

A cairn marks the summit, which is 884 m high and has a prominence of 13 m from the ridge.[3] To the west the ground slopes gradually away from the summit, merging with the western slope of Nethermost Pike.

Routes

Walkers may reach the summit of High Crag by taking a short diversion from the ridge path. Small paths lead to and from the summit cairn, but are much less worn than the path that bypasses it, only 60 m from the cairn.

For climbers, two gullies and a buttress lead up the steep eastern face of High Crag.[4]

Summit

The flat summit of High Crag is marked by a cairn which is visible from the neighbouring tops.

The summit is a high perch from which there is a bird's-eye view down into Ruthwaite Cove, flanked by the two eastern ridges of Nethermost Pike and Dollywaggon Pike, and with its tiny tarn, Hard Tarn. Then the view goes on down Grisedale to Ullswater and Place Fell, with the Pennine Hills in the distance.

Geology

Piece of lapilli-tuff of the Helvellyn Tuff Formation, found on High Crag

ハイ・クラッグは、ヘルヴェリン凝灰岩層の火山礫凝灰岩のみで構成されています。[ 5 ]この層はボローデール火山群の一部であり、約4億5000万年前のオルドビス紀、古代大陸の縁辺部で活発な火山活動が続いた時期に形成されました。ヘルヴェリン凝灰岩層は、爆発的な火山噴火によって形成され、大量の非常に高温のガスと岩石からなる火砕流が発生しました。火砕流中の個々の火山礫、つまり半溶融状態の溶岩は、その上にある堆積物の重みで平らになりました。[ 6 ]

参考文献

  1. ^アルフレッド・ウェインライト(2003) [1955]. 『湖水地方フェルズ図鑑第1巻:東部フェルズ』 ロンドン: フランシス・リンカーン. ISBN 0711222274
  2. ^陸地測量部 1:25,000 エクスプローラー地図
  3. ^ 「英国とアイルランドの丘陵データベース」2014年6月27日閲覧
  4. ^ 「High Crag (Ruthwaite Cove)」 . UKClimbing.com . 2014年6月27日閲覧
  5. ^「1:50,000地質図」(地図)シートE029、ケズウィック(実線)英国地質調査所、1999年、ISBN 0751832294-英国地質調査所のGeology of Britain viewer」で閲覧できますまたはBGSのiGeologyスマートフォンアプリで
  6. ^ DG Woodhall (2000).ケズウィック地区の地質(BGSシートE029のシート説明) . ノッティンガム: 英国地質調査所.