The BGS Lexicon of Named Rock Units — Result Details
Asta Spilitic Formation
| Computer Code: | ASSP | Preferred Map Code: | notEntered |
|---|---|---|---|
| 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) |
||
| 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, 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 | |||