The BGS Lexicon of Named Rock Units — Result Details

Duchray Hill Gneiss Member

Computer Code: DHGN Preferred Map Code: symb
Status Code: Full
Age range: Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ)
Lithological Description: Schistose to gneissose semipelite, generally garnetiferous. Stromatic to granoblastic migmatites in the east passing westwards into predominantly schistose rocks.
Definition of Lower Boundary: Base of dominantly semipelitic succession overlying the dominantly psammitic and quartzitic Corrydon Psammite Member in the Glen Shee area and the volcanic Farragon Volcanic Formation farther west.
Definition of Upper Boundary: Base of calcareous rocks of the overlying Loch Tay Limestone Formation.
Thickness: Not known
Geographical Limits: Glen Shee to upper Glen Isla.
Parent Unit: Ben Lui Schist Formation (BLUS)
Previous Name(s): Duchray Hill Gneiss [Obsolete Name And Code: Use DHGN] (DBDH)
Alternative Name(s): none recorded or not applicable
Type Area  Hillslopes on both the west and east sides of upper part of Glen Isla between Fergus and Auchavan. 
Crane, A, Goodman, S, Krabbendam, M K, Leslie, A G, Paterson, I B, Robertson, S and Rollin, K, 1996. Geology of the Glen Shee district. Memoir of the British Geological Survey, Sheet 56W and adjacent areas (Scotland). 
Williamson, W O, 1935. The composite gneiss and contaminated granodiorite of Glen Shee, Perthshire. Quarterly Journal of the Geological Society of London, Vol.91, 382-422. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S056 S065