| Computer Code: |
DRSP |
Preferred Map Code: |
symb |
| Status Code: |
Full |
| Age range: |
Tonian Period (AT)
— Tonian Period (AT) |
| Lithological Description: |
Pelitic gneiss, variably migmatitic, with minor gneissose semipelite and psammite. Calcsilicate bands occur within psammite. |
| Definition of Lower Boundary: |
Upon the Beinn An Tuim Striped Formation (BTU). |
| Definition of Upper Boundary: |
Overlain by the Tarvie Psammite Formation (TAPS) - Loch Eil Group, where predominantly pelitic lithologies pass eastwards into predominantly psammitic lithologies. |
| Thickness: |
Highly variable. |
| Geographical Limits: |
Northern Highlands, from Ardgour to Loch Arkaig. Restricted to the Sgurr Beag Nappe. |
| Parent Unit: |
Glenfinnan Group (GLEN)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| none recorded or not applicable |
| Reference(s): |
| Strachan, R A, May, F and Barr, D, 1988. The Glenfinnan and Loch Eil Divisions of the Moine Assemblage. 32-45 IIV Winchester, J A (editor). Later Proterozoic stratigraphy of the Northern Atlantic regions (Glasgow and London: Blackie). |
| Roberts, A M, Strachan, R A, Harris, A L, Barr, D and Holdsworth, R E, 1987. The Sgurr Beag Nappe: A reassessment of the stratigraphy and structure of the Northern Highland Moine. Geological Society of America Bulletin, Vol.98, 497-506. |
| 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. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S062
S061
S052
S053
S053
S061
|
