The BGS Lexicon of Named Rock Units — Result Details

Argyll Group

Computer Code: ARGY Preferred Map Code: Argy
Status Code: Full
Age range: Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ)
Lithological Description: See descriptions for; Islay Subgroup, Easdale Subgroup, Crinan Subgroup and Tayvallich Subgroup.
Definition of Lower Boundary: Generally transitional over a few metres at base of tillite of Port Askaig (Schiehallion) Boulder Bed.
Definition of Upper Boundary: Top of highest limestone bed in Loch Tay Limestone Formation where present; in Glen Clova and Glen Esk below unit with beds of strongly magnetic semipelite.
Thickness: Up to 9km
Geographical Limits: Scottish Highlands and Islands, and Northern Ireland: see entries for component subgroups.
Parent Unit: Dalradian Supergroup (DALN)
Previous Name(s): Middle Dalradian Group [Obsolete Name And Code: See ARGY] (DB)
Middle Dalradian (-4434)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  North-east Islay, Jura, Scarba, Garvellachs, Knapdale and mid-Argyll. 
Reference(s):
Stephenson, D and Gould, D , 1995. British Regional Geology: the Grampian Highlands (4th edition). (London: HMSO for the British Geological Survey), 67-68. 
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. 
Bailey, E B and Maufe, H B, 1960. The geology of Ben Nevis and Glen Coe (Second Edition). Memoir of the Geological Survey of the United Kingdom. (Scotland, Sheet 53). 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S012 S019 S020 S027 S028 S028 S029 S036 S037 S037 S045 S045 S046 S047 S053 S054 S055 S055 S056 S065 S065 S066 S066 S067 S075 S075 S076 S076 S077 S085 S086 S087 S087 S095 S096 S097 N08 S029 S035 S056 S038 S096 S044 S086 S053 S046 S086