| Computer Code: |
KTHL |
Preferred Map Code: |
symb |
| Status Code: |
Full |
| Age range: |
Neoproterozoic Era (AZ)
— Neoproterozoic Era (AZ) |
| Lithological Description: |
Mostly semipelite with thick beds of metalimestone and thinner impure metalimestone, calc-silicate rock and quartzite. |
| Definition of Lower Boundary: |
Bounded by lowest thrust plane in the Keith Shear-zone, normally marked by a sheet of highly sheared, gneissose metagranite. |
| Definition of Upper Boundary: |
Highest thrust plane in the Keith Shear-zone, normally marked by a sheet of highly sheared metagranite. |
| Thickness: |
Maximum seen 300 m, but this is attenuated by shearing. |
| Geographical Limits: |
Entirely within the Keith Shear-zone between Blackhill Wood (NJ 403 490) and Clochmacreich (NJ 493 582), Keith, Banffshire. Also between Rosarie (NJ 380 501) and Hillockhead (NJ 400 497) |
| Parent Unit: |
Appin Group (APP)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Reference Section |
British Geological Survey Rosarie Borehole, Rosarie Quarry, 4 km west of Keith. 0.9 m to 72.1 m (base, possibly faulted). |
| Type Section |
River Isla at Union Bridge (NJ4288 5083); continuing along railway cutting in Old Keith between Union Bridge (NJ 4285 5074) and Cuthill Quarry (NJ 4260 5035); then along track between Cuthill Quarry (NJ 4260 5032) and Brandy Pool (NJ 4252 4963). This area also covered by several boreholes from the Keith Bypass investigation (SE 12866) |
| Reference(s): |
| Sheet Explanation Scotland Sheet 85. (In preparation) |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S085
S086
|
