| Computer Code: |
TCD2 |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Tonian Period (AT)
— Tonian Period (AT) |
| Lithological Description: |
Siltstone-mudstone, finely interbedded, grey, shaley; grey sandstone with ripple laminations. Coarsening upwards. |
| Definition of Lower Boundary: |
Conformably upon Slattadale Member (TCD1). |
| Definition of Upper Boundary: |
Sharp contact with overlying Allt na Beiste Member (ALBE) - the lower Member of the Applecross Formation (TCA). Marked by abrupt appearance of trough cross-bedded sandstone. |
| Thickness: |
115 m in type section. |
| Geographical Limits: |
Northwest Highlands, from Diabaig to Gairloch. |
| Parent Unit: |
Diabaig Formation (TCD)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| none recorded or not applicable |
| 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.) |
| 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: |
|
S091
|
