The BGS Lexicon of Named Rock Units — Result Details
Pandy Tuff Formation
| Computer Code: | PAT | Preferred Map Code: | notEntered |
|---|---|---|---|
| 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 Tuff [Obsolete Name and Code: Use PAT]
(-3605)
Pandy Ash [Obsolete Name and Code: Use PAT] (-1113) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| none recorded or not applicable | |||
| Reference(s): | |||
| 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. | |||
| 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. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E120 E136 E137 | |||