| Computer Code: |
KILD |
Preferred Map Code: |
symb |
| Status Code: |
Full |
| Age range: |
Tonian Period (AT)
— Tonian Period (AT) |
| Lithological Description: |
Psammite, siliceous to micaceous, medium-grained. Psammite shows locally tabular and trough cross-bedding. Subordinate layers of quartz and schistose semipelite. Locally very thin (<5 cm) schistose para-amphibolite. |
| Definition of Lower Boundary: |
Not exposed. Base is interpreted to be cut by the Skinsdale Thrust. |
| Definition of Upper Boundary: |
Conformable overlain by the Suisgill Semipelite Formation (SUIS), with a gradational (100 m) boundary marked by increasing semipelitic layers. Locally overlain by the Scaraben Quartzite Formation (SCAB), but not exposed. |
| Thickness: |
none recorded or not applicable
|
| Geographical Limits: |
Northern Highlands: East Sutherland and Caithness. Restricted to the Skinsdale Nappe. |
| Parent Unit: |
Loch Eil Group (LEIL)
|
| Previous Name(s): |
Kildonan Psammite [Obsolete Name and Code: Use KILD]
(-2874)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Reference Section |
Reference sections at Suisgill Burn [NC 915 271]; Torrish Burn [NC 971 199]. |
| Reference(s): |
| Strachan, R A, 1989. The metamorphic rocks of the Scaraben area, East Sutherland and Caithness. Scottish Journal of Geology, Vol.24, 1-13. |
| 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: |
|
S103
S103
S109
S109
|
