Badenoch Group


The Badenoch Group is a sequence of metamorphosed Tonian age sedimentary rocks that outcrop across the Central Highlands of Scotland, east of the Great Glen. This rock sequence has formerly been referred to as the Central Highland Migmatite Complex and the Central Highland Division.

Badenoch Group
Stratigraphic range: Tonian
TypeGroup
Unit ofMoine Supergroup
Sub-unitsDava Subgroup, Glen Banchor Subgroup
UnderliesGrampian Group, ?Appin Group
Overliesnot seen
Thicknessseveral kilometres
Lithology
Primarypsammite
Othersemipelite, gneissose quartzite
Location
RegionGrampian Mountains
Type section
Named forBadenoch

Badenoch Group rocks extend across the Monadhliath Mountains and some surrounding areas largely between the Great Glen and Ericht-Laidon fault belts though their margins are hidden beneath younger strata; Old Red Sandstone to the north and west and Grampian Group rocks elsewhere.[1][2]

The succession is divided into two subgroups; the Dava Subgroup (previously referred to as the Dava Succession) and the Glen Banchor Subgroup. The former, named from the locality of Dava between Inverness and Grantown-on-Spey includes the Slochd Psammite and Flichity Semipelite formations. The latter is named for Glen Banchor, west of Newtonmore, the type area being from here to Laggan. The Glen Banchor sequence is believed to be between 1 and 1.5km thick and unconformably overlain by rocks of the Grampian and Appin groups, though the boundary may be tectonic in nature. [3] Long the subject of debate as to how they relate to surrounding rock sequences, some geologists place the Badenoch Group within the Moine Supergroup whilst others describe them as simply ‘Moine-like’. The lithologies of these rocks suggest deposition in shallow marine conditions.[4][5]

References
  1. http://nora.nerc.ac.uk/503510/1/Bedrock%20Geology%20and%20Physiography_revised%20version.pdf Bedrock Geology and Physiography of the Monadhliath Mountains
  2. http://www.bgs.ac.uk/lexicon/lexicon.cfm?pub=BADN
  3. http://www.bgs.ac.uk/lexicon/lexicon.cfm?pub=GLBA
  4. British Geological Survey 2007. 1:625,000 scale Bedrock Geology UK North 5th edition (map)
  5. Strachan, R.A., Harris, A.L., Fettes, D.J. & Smith, M. 2002 The Highland and Grampian Terranes. In: Trewin, N.H. (ed) The Geology of Scotland. The Geological Society, London p93
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