| 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
|
