The BGS Lexicon of Named Rock Units — Result Details

Garnel Burn Pelite Member

Computer Code: GBPE Preferred Map Code: SYMB
Status Code: Full
Age range: Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ)
Lithological Description: Biotite-andalusite schist, grey, coarse-grained, highly magnetic; forms prominent "tombstone-like" outcrops.
Definition of Lower Boundary: Junction of magnetic biotite-andalusite schist with underlying quartzite of the Grumack Hill Quartzite Member (Blackwater Formation).
Definition of Upper Boundary: Upper limit of coarse-grained biotite-andalusite schist outcrops and/or limit of magnetic anomaly at base of semi-pelites of Clashindarroch Formation.
Thickness: To 150m
Geographical Limits: Watershed ridge on SE side of River Deveron valley between NJ 441 351 and Auchmair NJ 405 312.
Parent Unit: Clashindarroch Formation (CLAS)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Type Area  Outcrops along crest of Grumack Hill, northeast of Garnel Burn. 
Fettes, D J, Lesley, A G, Stephenson, D and Kimbell, S F, 1991. Disruption of Dalradian stratigarphy along the Portsey Lineament from new geological and magnetic surveys. Scottish Journal of Geology, Vol.27, 57-73. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S075 S085 S086