| Computer Code: |
PWYD |
Preferred Map Code: |
notEntered |
| Status Code: |
Index Level |
| Age range: |
Ediacaran Period (AD)
— Ediacaran Period (AD) |
| Lithological Description: |
Strongly sheared and retrogressed hornblende-garnet amphibolites and subordinate felsic gneisses. |
| Definition of Lower Boundary: |
Unknown. |
| Definition of Upper Boundary: |
Unknown, except unconformably overlain by lower Ordivician (Arenig) sediments. |
| Thickness: |
Unknown. |
| Geographical Limits: |
Sheet 133 (Aberdaron). |
| Parent Unit: |
Sarn Complex (SRN)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Eastern side of Parwyd Cove, Lleyn Peninsula. Gibbons W and McCarroll D, 1993. |
| Reference(s): |
| Shackleton, R M. 1956. Notes on the structure and relations of the Precambrian and Ordovician rocks of southwestern Lleyn (Carnarvonshire). Geological Journal, Vol.1. 400-409. |
| Matley C A. 1928. The Pre-Cambrian complex and assocciated rocks of south-western Lleyn (Carnarvonshire). Quarterly Journal of the Geological Society of London, Vol. 84, 440-501. |
| Gibbons W. 2000. Braich-y-pwll to Parwyd. 174-179 in Precambrian Rocks of England and Wales. Carney J (Editor). Geological Conservation Review Series No 20. (Peterborough: Joint Nature Conservation Committee). |
| Gibbons, W and Horak, J. 1990. Contrasting metamorphic terranes in northwest Wales. 315-327 in D'Lemos, R S, Strachan, R A and Topley, C G (editors),The Cadomian Orogeny. Geological Society of London Special Publication No.51. |
| Gibbons W and McCarroll D. 1993. Geology of the country around Aberdaron, including Bardsey Island. Memoir of the British Geological Survey, Sheet 133 (England and Wales). (London: H.M.S.O.). 88pp. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E133
|
