The BGS Lexicon of Named Rock Units — Result Details

Upper Dalradian Group [Obsolete Name And Code: See SOHI]

Computer Code: DC Preferred Map Code: notEntered
Status Code: Index Level
Age range: Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ)
Lithological Description: Semi-pelitic and psammitic greywacke carbonaceous pelite, volcanics with limestones and conglomerates.
Definition of Lower Boundary: Drawn at base of semi-pelitic and psammitic wacke of the Southern Highland Group where it rests conformably on limestone interpreted as belonging to the Tayvillich Sub-Group.
Definition of Upper Boundary: Drawn at unconformable upward passage from greywacke and carbonaceous pelite of the Southern Highland Group to spilitic lava of Arenig age.
Thickness: Approximately > 5000 metres.
Geographical Limits: Antrim, Inishowen, Sperrin Mountains, Ox Mountains, Ireland. Inner Hebrides, Strathclyde, Central, Tayside, Grampian, Scotland.
Parent Unit: Dalradian Rocks (Undifferentiated) [Obsolete Name And Code: See DALN] (D)
Previous Name(s): Upper Dalradian Group (Now Southern Highland Group) (-3986)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Southern Highlands, Scotland, from Aberdeen to Kintyre. 
Reference(s):
Johnson, M R W, 1983. Dalradian. "In" Craig, G Y. Geology of Scotland, Edinburgh. 
Knill, J L, 1963. A sedimentary history of the Dalradian Series. "In" Johnson, M R W and Stewart, F H, (Editors). The British Caledonides, p.99-121. 
Anderson, J G C. 1948. Stratigraphic nomenclature of Scottish metamorphic rocks. Geological Magazine, Vol.85, 89-96. 
Johnstone, G S, 1966. The Grampian Highlands. British Regional Geology. 
Harris, A L and Pitcher, W S, 1975. The Dalradian Supergroup. "In" Harris, A L, Shackleton, R M, Watson, J, Downie, C, Harland, W B and Moorbath, S. A correlation of the Precambrian rocks in the British Isles. Geological Society Special Report, No.6. p.52-75. Scottish Academic Press, Edinburgh. 
Wilson, H E. 1972. The regional geology of Northern Ireland. (Belfast: HMSO for Geological Survey of Northern Ireland.) 113pp. 
Rast, N, 1963. Structure and metamorphism of the Dalradian rocks of Scotland. "In" Johnson, M R W and Stewart, F H, (Editors). The British Caledonides, Edinburgh, p.123-142. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable