The BGS Lexicon of Named Rock Units — Result Details

Raglan Mudstone Formation

Computer Code: RG Preferred Map Code: Rg
Status Code: Full
Age range: Pridoli Epoch (SO) — Pridoli Epoch (SO)
Lithological Description: Red mudstones and silty mudstones with calcretes and sandstones. Townsend Tuff Bed 100m from top; Bishop's Frome Limestone at top.
Definition of Lower Boundary: Conformable junction with underlying Downton Castle Sandstone Formation.
Definition of Upper Boundary: Drawn at top of Bishop's Frome Limestone.
Thickness: To c.800m
Geographical Limits: Welsh Borderland.
Parent Unit: Downton Subgroup (DOW)
Previous Name(s): Red Downtonian [Obsolete Name And Code: See RG] (RD)
Raglan Marl Group [Obsolete Name And Code: Use RG] (RMG)
Raglan Marl Formation (*938)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Area around the town of Raglan, Gwent. 
Reference(s):
Welch, F B A and Trotter, F M. 1961. Geology of the country around Monmouth and Chepstow. Explanation of one-inch geological sheets 233 and 250. Memoir of the Geological Survey of Great Britain. 
Barclay, W J, Jackson, D I, Mitchell, M, Owen, B, Riley, N J, White, D E, Strong, G E and Monkhouse, R A. 1989. Geology of the South Wales Coalfield, Part II, the country around Abergavenny. Memoir of the British Geological Survey. 
Brandon, A. 1989. Geology of the country between Hereford and Leominster. Memoir for 1:50 000 Geological Sheet 198. 
White, D E and Lawson, J D, 1989. The Pridoli Series in the Welsh Borderland and south central Wales. 131-141 in A global standard for the Silurian System. Holland, C H and Bassett, M G (editors) National Museum of Wales, Geological Series No. 9, Cardiff. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E198 E216 E232 E263 E230 E212 E197 E213 E180 E214 E199 E181