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): Raglan Marl Group [Obsolete Name And Code: Use RG] (RMG)
Raglan Marl Formation (*938)
Red Downtonian [Obsolete Name And Code: See RG] (RD)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Area around the town of Raglan, Gwent. 
Reference(s):
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. 
Brandon, A. 1989. Geology of the country between Hereford and Leominster. Memoir for 1:50 000 Geological Sheet 198. 
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. 
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. 
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