The BGS Lexicon of Named Rock Units — Result Details

RAGLAN MUDSTONE FORMATION
Computer Code: RG  Status Code: FORMAL ENTRY 
Preferred Map Code: Rg 
Age or Age Range: [ SO ] PRIDOLI  to [  ]  
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: Parent Unit Code:
DOWNTON GROUP  DOW
Previous Name(s): Previous Code(s):
RAGLAN MARL GROUP  RG 
RAGLAN MARL FORMATION  RG 
RED DOWNTONIAN  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. "in" Holland, C H and Bassett, M G, (Editors). A Global Standard for the Silurian System. National Museum of Wales, Geological Series No.9, p.131-141. 
Brandon, A. 1989. Geology of the country between Hereford and Leominster. Memoir for 1:50 000 Geological Sheet 198. 
Welch, F B A and Trotter, F M, 1960. Geology of the country around Monmouth and Chepstow. Memoir of the Geological Survey of Great Britain. 
Barclay, W J, 1989. Geology of the South Wales Coalfield, Part II, the country around Abergavenny. Memoir of the British Geological Survey, Sheet 232, (England and Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
Map Code Sheet Name
E  216
E  198
E  232
E  263
E  213
E  180
E  212
E  230
E  197
E  214
E  199
E  181

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