Computer Code: |
PTMN |
Preferred Map Code: |
PT |
Status Code: |
Full |
Age range: |
Neoproterozoic Era (AZ)
— Neoproterozoic Era (AZ) |
Lithological Description: |
Gneissose semipelite with quartzose psammites and micaceous psammites, distinctive garnetiferous calc-silicate bands and pods. |
Definition of Lower Boundary: |
Transitional contact. Quartzose psammites and semipelites at base contrast with underlying striped micaceous psammites / semipelites of the Loch Laggan Psammite Formation. |
Definition of Upper Boundary: |
Transitional contact, marked in places by quartzose psammites and semipelite passing up into overlying micaceous and feldspathic psammites of the Loch Laggan Psammite Formation. |
Thickness: |
270m in type area. |
Geographical Limits: |
Central Monadhliath Highlands: Speyside, Kingussie - Newtonmore area. Possibly extending southwest to Crubenmore area. |
Parent Unit: |
Loch Laggan Psammite Formation (LLGN)
|
Previous Name(s): |
none recorded or not applicable
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
Reference Section |
Summit area of Creag Bheag 1 km NW of Kingussie. |
Type Section |
Raitts Burn, 1 km north of Creag Bheag, Speyside. |
Reference Section |
North-eastern flanks and summit areas of Creag Mhor - Creag Dubh. |
Reference(s): |
none recorded or not applicable |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
S074
S064
|