| 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: |
Unconformably overlain by Grampian and Appin Group rocks (Dalradian Supergroup - DALN); unconformity is commonly sheared. |
| 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: |
Loch Ness Supergroup (LNES)
|
| Previous Name(s): |
Central Highland Migmatite Complex
(CEHI)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| 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. |
| 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(s): |
| Krabbendam, M. 2021. A stratigraphic framework for the early Neoproterozoic successions of the Northern Highlands of Scotland. UK Stratigraphic Framework Series. British Geological Survey Open Report, OR/21/072. 86pp. |
| Leslie, A G, Robertson, S, Smith, M, Banks, C J, Mendum, J R, and Stephenson, D. 2013. The Dalradian rocks of the northern Grampian Highlands of Scotland. Proceedings of the Geologists' Association, Vol. 124, 263-317. |
| Robertson, S, and Smith, M. 1999. The significance of the Geal Charn-Ossian steep belt in basin development in the central Scottish Highlands. Journal of the Geological Society, Vol. 156, 1175-1182. |
| Highton, A J, Hyslop, E K, and Noble, S R. 1999. U-Pb zircon geochronology of migmatization in the northern Central Highlands: evidence for pre-Caledonian (Neoproterozoic) tectonometamorphism in the Grampian block, Scotland. Journal of the Geological Society, Vol. 156, 1195-1204. |
| Cawood, P A, Nemchin, A A, Smith, M, and Loewy, S. 2003. Source of the Dalradian Supergroup constrained by U-Pb dating of detrital zircon and implications for the East Laurentian margin. Journal of the Geological Society, Vol. 160, 231-246. |
| 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.) |
| 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
|
