The BGS Lexicon of Named Rock Units — Result Details
Pandy Tuff Formation
Computer Code: | PAT | Preferred Map Code: | notEntered |
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Status Code: | Pending Upgrade | ||
Age range: | Soudleyan Substage (OY) — Longvillian Substage (OL) | ||
Lithological Description: | Welded and non-welded felsic ash-flow lapilli crystal tuffs and thin mudstones. | ||
Definition of Lower Boundary: | Conformable sharp junction with underlying siltstones and mudstones of the Teirw Siltstone Formation. | ||
Definition of Upper Boundary: | Conformable gradational junction with the Bryn Siltstone Formation. | ||
Thickness: | To 37m | ||
Geographical Limits: | Not defined. | ||
Parent Unit: | Not Available (!) | ||
Previous Name(s): | Pandy Ash [Obsolete Name and Code: Use PAT]
(-1113)
Pandy Tuff [Obsolete Name and Code: Use PAT] (-3605) |
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Alternative Name(s): | none recorded or not applicable | ||
Stratotypes: | |||
none recorded or not applicable | |||
Reference(s): | |||
Brenchly, P J. 1964. Ordovician ignimbrites in the Berwyn Hills, North Wales. Geological Journal, Vol. 4, 43-54 | |||
Brenchley, P J. 1978. The Caradocian rocks of the North and West Berwyn Hills. Geological Journal, Vol. 13, 137-164. | |||
Wedd, C B, Smith, B, King, W B R and Wray, D A. 1929. Geology of the country around Oswestry. Memoir of the Geological Survey of Great Britain, Sheet 137. | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
E120 E136 E137 |