The BGS Lexicon of Named Rock Units — Result Details
Baron Hill Formation
| Computer Code: | BAH | Preferred Map Code: | notEntered |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Floian Age (OFL) — Darriwilian Age (ODW) | ||
| Lithological Description: | Dark to pale grey mudstone, siltstone and sandstone, containing clasts of felsic welded tuff, basalt and basaltic hyaloclastite, locally distrubed. Locally beds of felsic tuff. | ||
| Definition of Lower Boundary: | Overlies - with likely unconformity - Neoproterozoic rocks of Pen-y-Parc Formation. | ||
| Definition of Upper Boundary: | Overlain by further Ordovician strata of the Llyn Alaw group (ALAW). | ||
| Thickness: | At least 300 m thick. | ||
| Geographical Limits: | Anglesey, near Beaumaris. | ||
| Parent Unit: | Llyn Alaw Group (ALAW) | ||
| Previous Name(s): | Baron Hill Rocks [Obsolete Code: Use BAH]
(OBH)
Baron Hill Beds [Obsolete Name and Code: Use BAH] (-3189) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Section | Crags alongside track leading through Coed Parc to Baron Hill. Greenly, E, 1919. | ||
| Reference(s): | |||
| Greenly, E. 1944. The Arvonian rocks of Arvon. Quarterly Journal of the Geological Society of London, Vol. 100, 269-287. | |||
| Greenly, E. 1946. The Monio-Cambrian interval. Geological Magazine, Vol. 83, 237-240. | |||
| Carney J N, et al. 2000. Precambrian rocks of England and Wales. Geological Conservation Review Series. No 20. (Peterborough: Joint Nature Conservation Committee.) 252 pp. | |||
| Greenly, E. 1919. The Geology of Anglesey, Vol 2. Memoir of the Geological Survey of Great Britain (England and Wales). (London: HMSO.) | |||
| Reedman, A J, Leveridge, B E and Evans, R B. 1984. The Arfon Group (Arvonian?) of North Wales. Proceedings of the Geologists' Association, Vol.95, 313-321. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E093 E105 | |||