The BGS Lexicon of Named Rock Units — Result Details

Innellan Group

Computer Code: DCIG Preferred Map Code: notEntered
Status Code: Full, pending ratification
Age range: Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ)
Lithological Description: Pebbly schistose grits, schistose grits, greywackes, black and green slates. Black slates occur with sporadic seams of dark lime and grit. Conglomerate also occurs. (Innellan Group = stratigraphic equivalent of the Dunoon Phyllites).
Definition of Lower Boundary: Drawn at base of semi-pelitic wacke of the Innellan Group where it rests conformably on psammitic wacke of the Bullrock Greywacke.
Definition of Upper Boundary: Drawn at unconformable upward change from conglomerate and semi-pelitic wacke of the Innellan Group to probable Upper Old Red Sandstone.
Thickness: 1000m approx.
Geographical Limits: Strathclyde, Scotland.
Parent Unit: Not Entered (?)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Innellan, Strathclyde, Scotland. 
Reference(s):
Roberts, J L, 1966. Sedimentary affiliations and stratigraphic correlation of the Dalradian rocks in the south-west Highlands of Scotland. Scottish Journal of Geology, Vol.2, 200-223. 
Harris, A L and others, 1973. A correlation of the Pre-Cambrian rocks in the British Isles. Geological Society of London Special Report No 6. 
Roberts, J L, 1974. The structure of the Dalradian rocks in the south-west Highlands of Scotland. Journal of the Geological Society, Vol.130, p.93-124. 
Paterson, I B and others, 1990. Geology of the Greenock district. Memoirs of the Geological Survey of Great Britain, Sheet 30W. (Scotland). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable