The BGS Lexicon of Named Rock Units — Result Details

Dunrossness Phyllitic Formation [Obsolete Code: Use DUPH]

Computer Code: DBDP Preferred Map Code: notEntered
Status Code: Index Level
Age range: Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ)
Lithological Description: Chlorite-chloritoid phyllite containing a few thin bands of quartzite. Kyanite occurs in quartz segregations and staurolite in metamorphic aureoles.
Definition of Lower Boundary: Drawn at base of pelitic wacke interpreted to belong to the Dunrossness Phyllitic (Formation) where it rests conformably on pelite and semi-pelite interpreted to belong to the Clift Hills Phyllitic (Formation).
Definition of Upper Boundary: Drawn at conformable upward passage from pelitic wacke interpreteted to belong to the Dunrossness Phyllitic (Formation), to meta-spilite of the Dunrossness Spilitic Formation.
Thickness: 750m approx.
Geographical Limits: Shetlands, Scotland.
Parent Unit: Middle Dalradian Group [Obsolete Name And Code: See ARGY] (DB)
Previous Name(s): Dunrossness Phyllite (-1478)
Dunrossness Phyllitic Group (-3980)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Wick of Shunni, Shetland, Scotland. 
Reference(s):
Mykura W, 1976 British Regional Geology: Orkney and Shetland (HMSO, Edinburgh).] 
Harris, A L and others, 1973. A correlation of the Pre-Cambrian rocks in the British Isles. Geological Society of London Special Report No 6. 
Flinn, D, and others, 1972. A revision of the stratigraphic succession of the East Mainland of Shetland. Scottish Journal of Geology, Vol.8, p. 335-343. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable