The BGS Lexicon of Named Rock Units — Result Details

Durn Hill Quartzite Formation

Computer Code: DBDQ Preferred Map Code: DuQu
Status Code: Full
Age range: Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ)
Lithological Description: Quartzite, massive to blocky, locally feldspathic. Micaceous quartzite at base in southern part of outcrop.
Definition of Lower Boundary: Change from interbedded psammite and semipelite of Arnbath Formation, where present, or pelite and limestone of Fordyce Limestone Formation, to thicker-bedded quartzite.
Definition of Upper Boundary: Rapid transition to pelite (graphitic near coast) at base of Castle Point Pelite Formation.
Thickness: c.400m on Durn Hill, thinning to c.150m at coast. Probably repeated by folding and thrusting on Knock Hill and farther south.
Geographical Limits: Coast section from 150m southeast of Foul Hole to John Legg's Well [NJ 579 666 to 580 665]; extends southwards as far as Braco [NJ 498 512]. Equivalent to the Kymah Quartzite farther south.
Parent Unit: Islay Subgroup (DBIS)
Previous Name(s): Upper Part Of Durn Hill Quartzite (-4588)
Alternative Name(s): Kymah Quartzite Formation
Stratotypes:
Reference Section  Coastal section from 150m southeast of Foul Hole to John Legg's Well. 
Partial Type Section  Durn Hill Quarry. 
Reference(s):
Stephenson, D, et al. 1993. Stratigraphy and correlation of the Dalradian rocks of the East Grampian Project area. British Geological Survey Technical Report WA/93/91. 
Harris, A L, Haselock, P J, Kennedy, M J and Mendum, J R, 1994. The Dalradian Supergroup in Scotland, Shetland and Ireland. 33-53 in Gibbons, W E and Harris, A L (editors). A revised correlation of Precambrian rocks in the British Isles. Special Report of the Geological Society, London, No.22. 
Read, H H, 1923. Geology of the country around Banff, Huntly and Turriff, Lower Banffshire and north-west Aberdeenshire. Memoir of the Geological Survey, Scotland Sheets 86 and 96 (Scotland). 
Stephenson, D and Gould, D , 1995. British Regional Geology: the Grampian Highlands (4th edition). (London: HMSO for the British Geological Survey), 67-68. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S096 S086