The BGS Lexicon of Named Rock Units — Result Details

Diebidale Pelite Formation

Computer Code: DIEP Preferred Map Code: SYMB
Status Code: Full
Age range: Proterozoic Eon (AP) — Proterozoic Eon (AP)
Lithological Description: Massive, schistose, garnet-mica bearing pelite and semipelite, with calc-silsicate bands, increasingly pelitic towards the top.
Definition of Lower Boundary: Overlies the Crom Psammitic Formation, defined as where predominantly psammitic lithologies pass into predominantly pelitic lithologies.
Definition of Upper Boundary: The upper boundary cannot be seen, as it is obscured by the Carn Chuinneag-Inchbae Granite Gneiss Intrusion.
Thickness: Not recorded.
Geographical Limits: Surrounds the northern part of the Carn Chuinneag intrusion, forming a nearly continuous outcrop from Glen Diebidale (NH440830), to the western end of the Dornoch Firth (around NH560890), to Kildermorie Forest (NH470790), its southerly extent apparently thinning out near Beinn nan Eun (NH448760).
Parent Unit: Morar Group (MORR)
Previous Name(s): Upper Pelite (-4608)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Cnoc na Tuppat and burn section in Garbh Allt to the east, 1.7 to 2 km south-east of Glencalvie Lodge, Strath Carron. 
Reference(s):
Shepherd, J. 1970. The structure and metamorphism of the Carn Chuinneag area, Ross-shire. (University of Edinburgh.: unpublished PhD thesis.) 
Wilson, D. 1975. Structure and metamorphism of the Ben Wyvis District, Ross-shire. (University of Edinburgh: Unpublished PhD thesis.) 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S093 S093 S093