The BGS Lexicon of Named Rock Units — Result Details

Kymah Quartzite Formation

Computer Code: KYQU Preferred Map Code: SYMB
Status Code: Full
Age range: Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ)
Lithological Description: Quartzite, massive, gritty and cross-bedded in places. Basal part locally more psammitic. 'Boulder Bed' locally near base (with granite clasts in some outcrops). Amphibolitic pillow lavas and metavolcanic rocks near the base in Kymah Burn.
Definition of Lower Boundary: Lower limit of massive quartzite overlying either Laddder Hills Formation or Nochty Semipelite and Limestone Formation.
Definition of Upper Boundary: Upper limit of massive quartzite below Culchavie Striped Formation.
Thickness: Generally 500 - 600m. Variable from 15m to 650m. Thin on Upper Donside (Allargue area).
Geographical Limits: Southwest from the River Deveron, 6.5km west of Huntly, to Garbet Hill and thence from Scaut Hill southwards through Upper Strathdon to Glen Fenzie. Also SSE trending band from Delavorar in Glen Avon via Liath Beinn, Well of Don and Meikle Geal Charn to the Glen Gairn Granite. Also in the Lecht - Allargue - Carn Ealasaid - Carn Oighreag area of Upper Donside.
Parent Unit: Islay Subgroup (DBIS)
Previous Name(s): Durnhill Quartzite (-3507)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Lower part of Muckle Fergie Burn. 
Reference Section  Central part of Ernan Water section, Glen Ernan. 
Partial Type Section  Kymah Burn by the Eachrach. 
Reference(s):
Memoir of the British Geological Survey, Sheet 75, in preparation. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S075 S075