The BGS Lexicon of Named Rock Units — Result Details

Badenoch Group

Computer Code: BADN Preferred Map Code: BADE
Status Code: Full
Age range: Tonian Period (AT) — Tonian Period (AT)
Lithological Description: The Badenoch Group includes metasedimentary rocks, mainly psammites and semipelites (Dava and Glen Banchor subgroups) that are generally gneissose and migmatitic or locally non-migmatitic, some gneissose quartzites and garnetiferous semipelitic gneiss with associated minor metamafic rocks. Major rock type(s): gneissose psammite and semipelite, migmatitic psammite and semipelite. Subsidiary rock type(s): schistose semipelite, micaceous psammite, quartzite. Trace rock type(s): garnetiferous migmatitic semipelite, feldspathic psammite, metadolerite, metagabbro.
Definition of Lower Boundary: Base of the group not seen; probably cut out by the Great Glen Fault.
Definition of Upper Boundary: The top of the group as exposed in the Nairn district is the structural top of the Glen Banchor Subgroup, which is structurally (unconformably?) overlain by Grampian Group strata. In other areas, such as the Tomatin district, the Glen Banchor Subgroup appears to be unconformably overlain by the Grampian Group (Ruthven Semipelite Formation). In the Dalwhinnie district it is considered to be overlain by the Grampian and Appin groups, which progressively overstep (Robertson and Smith, 1999) the Glen Banchor Subgroup.
Thickness: In the order of several kilometres.
Geographical Limits: The Central Highlands of Scotland from the Nairn-Fortrose-Beauly-Aviemore districts south-westwards into the Tomatin-Foyers districts, and in the Laggan Inlier in the Newtonmore and Dalwhinnie districts.
Parent Unit: Not Applicable (-)
Previous Name(s): Central Highland Migmatite Complex (CEHI)
Alternative Name(s): Central Highland Division
Stratotypes:
Type Area  The type area in the Central Highlands includes the Laggan Inlier (NN 61 94) and the area between Strath Dearn (NH 76 25) and Dava (NH 99 38). Leslie et al., 1999. 
Reference Section  A reference section is taken from NH 950 310 to NH 987 338, around Loch an t-Sidhein in the south of the Nairn district. 
Type Area  The type area in the Central Highlands includes the area between Strath Dearn (NH 76 25) and Dava (NH 99 38), and the Laggan Inlier (NN 61 94). Leslie et al., 1999. 
Reference(s):
Nairn 1:50k Bedrock Geological Map (in prep.). 
Leslie, A G, Chacksfield, B, Smith, M and Smith, R A. 1999. The geophysical signature of a major shear zone in the Central Highlands of Scotland. Contract GA/97E/50. British Geological Survey Technical Report WA/99/32R. (Note: the name 'Badenoch Group' does not appear in this reference; the unit is described as Dava and Glen Banchor successions.) 
Smith, M, Robertson, S and Rollin, K R. 1999. Rift basin architecture and stratigraphical implications for basement-cover relationships in the Neoproterozoic Grampian Group of the Scottish Caledonides. Journal of the Geological Society, London, Vol. 156, 1163-1173. (Note: the name 'Badenoch Group' does not appear in this reference; the unit is described as Dava and Glen Banchor successions.) 
British Geological Survey. 2004. Tomatin. Scotland Sheet 74W. Bedrock Geology. 1:50 000 Geology Series. (Keyworth, Nottingham: British Geological Survey). (Note: the name 'Badenoch Group' does not appear in this reference; the unit is described as Dava and Glen Banchor successions.) 
Harris, A L, Haselock, P J, Kennedy, M J and Mendum, J R, 1994. The Dalradian Supergroup in Scotland, Shetland and Ireland. 33-53 in Gibbons, W E and Harris, A L (editors). A revised correlation of Precambrian rocks in the British Isles. Special Report of the Geological Society, London, No.22. 
Fletcher, T P et al. 1996. Geology of the Fortrose and eastern Inverness district. Memoir of the British Geological Survey, Sheet 84W (Scotland). 
Highton, A J, 1999. Solid geology of the Aviemore district. Memoir of the British Geological Survey, sheet 74E [Scotland]. 
Piasecki, M A J, 1980. New light on the Moine rocks of the Central Highlands of Scotland. Journal of the Geological Society, London, Vol. 137, p. 41 - 68. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S063 S064 S073 S074 S074 S083 S084 S084