The BGS Lexicon of Named Rock Units — Result Details

Glen Buck Pebbly Psammite Formation

Computer Code: GBUCK Preferred Map Code: BU
Status Code: Full
Age range: Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ)
Lithological Description: Quartzofeldspathic psammites (local arkosic) with semipelite, pebbly and microconglomeratic beds.
Definition of Lower Boundary: Not seen - faulted against Moine and Old Red Sandstone rocks.
Definition of Upper Boundary: Not seen - faulted and sheared against Tarff Banded Formation. Contact defined in part by the Eilrig Shear Zone.
Thickness: Up to 800 m.
Geographical Limits: Central Highlands of Scotland - Sheets 73W and 63W.
Parent Unit: Glenshirra Subgroup (GRGL)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Borlum Hill [WNW flank]. 
Reference Section  North of Loch Tarff on SSW end of ridge leading to Beinn A'bhacaidh. 
Type Section  Glen Buck. 
Reference(s):
May, F and Highton, A J, 1997. Geology of the Invermoriston district. Memoir of the British Geological Survey, sheet 73W [Scotland]. 
Key, R M, Clark, G C, May, F, Phillips, E R, Chacksfield, B C and Peacock, J D, 1997. Geology of the Glen Roy district. Memoir of the British Geological Survey, Sheet 63W [Scotland]. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S063 S073 S073