The BGS Lexicon of Named Rock Units — Result Details

MUCH WENLOCK LIMESTONE FORMATION
Computer Code: WEL  Status Code: FORMAL ENTRY 
Preferred Map Code: WeL 
Age or Age Range: [ SH ] HOMERIAN  to [  ]  
Lithological Description:
Pale grey nodular to thinly bedded limestones with reef bodies. 
Definition of Lower Boundary:
Base of lowest regularly bedded limestone in 2-3m transitional zone with underlying Coalbrookdale Formation. 
Definition of Upper Boundary:
Upward transition into alternating siltstones and limestones of the Elton Formation (ie lower part of Lower Ludlow Shale). 
Thickness:
29m in type area. 
Geographical Limits:
Welsh Borderland. 
Parent Unit: Parent Unit Code:
NO IMMEDIATE PARENT [HIERARCHY CODE: NO PARENT OF THE NEXT HIGHER RANK IS IDENTIFIED]  NOPAR
Previous Name(s): Previous Code(s):
WENLOCK LIMESTONE  WEL 
Alternative Name(s):
none recorded or not applicable
Stratotypes:
Type Section  Section for base (off-Reef tract). East side of the Longville in the Dale to Stanway road. (Bassett, 1989, p.59). 
Type Section  For base (Reef tract). Exposures on south side of A458 road cutting on Harley Hill, near Much Wenlock. (Bassett, 1989, p.59). 
Reference(s):
Bassett, M G, Cocks, L R M, Holland, C H, Rickards, R B and Warren, P T. 1975. The type Wenlock Series. Institute of Geological Science, Report No.75/13, p.19. 
Bassett, M G, 1989. The Wenlock Series in the Wenlock area. 51-73 in "A global standard for the Silurian System". Holland, C H and Bassett, M G, (editors). National Museum of Wales, Gelogical series No.9, Cardiff. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
Map Code Sheet Name
E  183
E  216
E  180
E  199
E  167
E  181

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