The BGS Lexicon of Named Rock Units — Result Details

Culchavie Striped Formation

Computer Code: CUST Preferred Map Code: SYMB
Status Code: Full
Age range: Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ)
Lithological Description: Notably striped, semipelites and psammites, laminated and thinly banded, slaty to schistose. Psammites more quartzose and abundant near the base of the formation. Semipelites dominate towards the top.
Definition of Lower Boundary: Rapid transition from quartzite of the underlying Kymah Quartzite Formation to striped semipelite - psammite unit.
Definition of Upper Boundary: Upper limit of semipelite at base of graphitic pelite of the Glenbuchat Graphitic Schist Formation.
Thickness: 285 - 1200m
Geographical Limits: c. 1km south of Cook's Cairn in the Blackwater Forest, and from the Allt na Craoibhe - Caorainn south to the Head of Glen Buchat, the Peat Hill, and SSE to Glen Conrie and Upper Glenfenzie (Sheet 75E). Also around summit of Carn Oighreag, on Hill of Allargue. On Sheet 75W stretches SSE from Reidh Dorch, across the Muckle Fergie Burn to Cairn Culchavie (Upper Donside) and Cairn Sawvie, where it is cut by the Glen Gairn Granite.
Parent Unit: Easdale Subgroup (DBED)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Type Section  Meoir Veannaich Burn from junction of Allt Coire Domhain and Allt Geal Charn downstream for 1.5 km. 
Reference Section  Corrie of Culchavie and Culchavie Burn section. 
Reference Section  Central part of Muckle Fergie Burn section. 
Memoir of the British Geological Survey, Sheet 75, in preparation. 
1:50K maps on which the lithostratigraphical unit is found, and map code used: