The BGS Lexicon of Named Rock Units — Result Details

Southern Highland Group
Computer Code: SOHI Preferred Map Code: notEntered
Status Code: Full
Age range: Neoproterozoic Era (AZ) — St David's Epoch (ED)
Lithological Description: A thick pile of psammitic and pelitic greywackes and associated rocks, some volcanic.
Definition of Lower Boundary: The top of the highest limestone recorded in the Tayvallich Subgroup
Definition of Upper Boundary: Gradual transition into overlying, less deformed, probable Ordovician rocks of lower metamorphic grade.
Thickness: >5000m
Geographical Limits: South Sperrin Mountains and Lack Inlier, Northern Ireland. Southern Highlands, Scotland
Parent Unit: Dalradian Supergroup (DALN)
Previous Name(s): Upper Dalradian Group [Obsolete Name And Code: See SOHI] (DC)
Upper Dalradian Group (-1836)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Dunkeld, Southern Highlands, Scotland. 
Type Area  Trossachs, northwest of Highland Boundary Fault. 
Type Area  Aberfoyle area, Southern Highlands, Scotland. 
Type Area  Callander area, Southern Highlands, Scotland. 
Reference(s):
Harris, A L and Fettes, D J, 1972. Stratigraphy and structure of Upper Dalradian rocks at the Highland Border. Scottish Journal of Geology, Vol.8 (3), p.253-264. 
Roberts, J L and Treagus, J E, 1979. Stratigraphical and structural correlation between the Dalradian rocks of the South-west and Central Highlands of Scotland. "In" Harris, A L and others. The Caledonides of the British Isles. 
Treagus, J E, 1987. The structural evolution of the Dalradian of the Central Highlands of Scotland. Transactions of the Royal Society of Edinburgh: Earth Sciences, Vol.78, p.1-15. 
Barrow, G and others, 1905. The geology of the country round Blair Atholl, Pitlochry and Aberfeldy. Memoirs of the Geological Survey. Scotland. 
Johnson, M R W, 1983. Dalradian. "In" Craig, G Y. Geology of Scotland, Edinburgh. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S038 S029 S037 S020 S012 S048 S021 S028 S055 S055 S056 S056 S066 S067 S030 S038 S045 S045 S039 S096 S076 S076 S086 S046 S046 S047 S047 S057 S086 S087 S087 S096 S097
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