| Computer Code: |
TA |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Stenian Period (AI)
— Stenian Period (AI) |
| Lithological Description: |
Conglomerate near base; red coarse, cross-bedded sandstone, locally with mudstone beds; green sandstone with mafic fragments and lapilli; thick bedded sandstone; massive mudstone with thin limestone beds. |
| Definition of Lower Boundary: |
Drawn at base of massive breccias of the Stoer Group where it rests unconformably on Lewisian Gneiss Complex. |
| Definition of Upper Boundary: |
Not exposed; the highest formation is eroded. Unconformably overlain by the Torridon Group via an angular unconformity. |
| Thickness: |
700 - 1500 m (minimum). |
| Geographical Limits: |
Northwest Highlands: Stoer Peninsula; Rubha Coigach, Gruinard Bay-Loch Maree; east of the Coigach Fault, and west of the Moine Thrust. |
| Parent Unit: |
Not Applicable (-)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Coastal section between Clachtoll and Rubh' a' Mhill Dheirg, Stoer peninsula, northwest Highlands. |
| Reference Section |
South side of Enard Bay, between Achnahaird bay and Garvie bay. |
| Reference(s): |
| Stewart, A D. 2002. The later Proterozoic Torridonian rocks of Scotland: their sedimentology, geochemistry and origin. Geological Society Memoir. Vol. 24. (The Geological Society.) |
| Parnell, J., Mark, D., Fallick, T.E., Boyce, A. and Thackrey, S., 2011. The age of the Mesoproterozoic Stoer Group sedimentary and impact deposits, NW Scotland. Journal of the Geological Society of London, 168: 349 - 358. |
| Rainbird, R.H., Hamilton, M.A. and Young, G.M., 2001. Detrital zircon geochronology and provenance of the Torridonian, NW Scotland. Journal of the Geological Society of London, 158: 15-27. |
| 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. |
| Darabi, M H, and Piper, J D A. 2004. Palaeomagnetism of the (Late Mesoproterozoic) Stoer Group, northwest Scotland: implications for diagenesis, age and relationship to the Grenville Orogeny. Geological Magazine, Vol. 141, 15-39. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S101
S091
S092
|
