The BGS Lexicon of Named Rock Units — Result Details
Asta Spilitic Formation
Computer Code: | ASSP | Preferred Map Code: | notEntered |
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Status Code: | Full | ||
Age range: | Neoproterozoic Era (AZ) — Neoproterozoic Era (AZ) | ||
Lithological Description: | Metasedimentary phyllite along with hornblendic phyllites and coarse-grained hornblendic rocks. | ||
Definition of Lower Boundary: | Drawn at base of metaspilite of the Asta Spilitic Formation where it rests conformably on the Laxfirth Limestone. | ||
Definition of Upper Boundary: | Drawn at conformable upward passage from meta-spilite of the Asta Spilitic Formation to semi-pelite of the Clift Hills Phyllitic (Formation). | ||
Thickness: | 250 m approx. | ||
Geographical Limits: | Shetlands, Scotland. | ||
Parent Unit: | Clift Hills 'Division' (DCF) | ||
Previous Name(s): | Asta Spilitic Formation [Obsolete Code: Use ASSP]
(DBAS)
Asta Spilitic Group (-655) |
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Alternative Name(s): | none recorded or not applicable | ||
Stratotypes: | |||
Type Area | Isles of Gletness, Shetland, Scotland. | ||
Reference(s): | |||
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. | |||
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. | |||
Mykura W, 1976 British Regional Geology: Orkney and Shetland (HMSO, Edinburgh).] | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
S126 S128 |