| Computer Code: |
STRC |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Tonian Period (AT)
— Tonian Period (AT) |
| Lithological Description: |
Metaconglomerate with heterogeneous clasts (quartzite, gneiss, vein quartz, quartz-magnetite rock, granite/pegmatite) in a green-grey psammite matrix. Occurs in two units, separated by psammite. The metaconglomerate is strongly sheared. |
| Definition of Lower Boundary: |
Unconformable upon Lewisian Gneiss inlier (L); unconformity highly sheared. |
| Definition of Upper Boundary: |
Conformably overlain by the remainder of the Altnaharra Psammite Formation (ALPS). |
| Thickness: |
c. 20 m (estimate of deformed rocks). |
| Geographical Limits: |
Northern Highlands: Sutherland: Ben Hutig to East Strathan. |
| Parent Unit: |
Altnaharra Psammite Formation (ALPS)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Area |
Type area at Traigh an t-Strathain [NC 57 64]. |
| Reference(s): |
| Holdsworth, R E, Strachan, R and Alsop, G I. 2001. Solid geology of the Tongue district; Memoir for 1:50 000 Geological Sheet 114 E (Scotland),British Geological Survey, Keyworth, Nottingham. |
| 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. |
| Mendum, J R. 1976. A strain study of the Strathan Conglomerate, North Sutherland. Scottish Journal of Geology 12, 135-146. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S114
|
