The BGS Lexicon of Named Rock Units — Result Details

Dunrossness Spilitic Formation

Computer Code: DUSP Preferred Map Code: notEntered
Status Code: Full, pending ratification
Age range: Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ)
Lithological Description: Metamorphosed lavas and pyroclastic rocks. The spilites are intercalated with metasediments, mainly graphitic phyllites, quartzites and cherts.
Definition of Lower Boundary: Drawn at base of meta-spilite of the Dunrossness Spilitic Formation where it rests conformably on pelitic wacke interpreted to belong to the Dunrossness Phyllitic (Formation).
Definition of Upper Boundary: Drawn at unconformable upward passage from meta-spilite of the Dunrossness Spilitic Formation to the Old Red Sandstone.
Thickness: Approximately 1000 metres.
Geographical Limits: Shetlands, Scotland.
Parent Unit: Clift Hills 'Division' (DCF)
Previous Name(s): Dunrossness Spilitic Group (-2159)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Aith Voe, 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:
S126