The BGS Lexicon of Named Rock Units — Result Details
Cloud Wood Member
Computer Code: | CLWD | Preferred Map Code: | CIW |
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Status Code: | Full | ||
Age range: | Holkerian Substage (CQ) — Asbian Substage (CR) | ||
Lithological Description: | Dark grey mudstones with thin dolostone and dolomitic siltstones, passing up into dolostones with common, thin grey and red mudstone beds and partings. | ||
Definition of Lower Boundary: | Base is marked by an unconformity/shear surface with sheared mudstone resting on dolomite of the Milldale Limestone Formation. | ||
Definition of Upper Boundary: | The top is marked by an abrupt change from thinly bedded dolostone with common mudstone partings to massive, finely crystalline dolostone. | ||
Thickness: | To 36m | ||
Geographical Limits: | Known only in Cloud Hill Quarry. | ||
Parent Unit: | Cloud Hill Dolostone Formation (CLHD) | ||
Previous Name(s): | Lower Red Bed and Pebble Bed Group [Obsolete Name and Code: Use CLWD]
(-3311)
Carboniferous Limestone [Obsolete Name and Code: Use CL] (-4550) Red Bed Member [Obsolete Name and Code: Use CLWD] (-4553) |
||
Alternative Name(s): | none recorded or not applicable | ||
Stratotypes: | |||
Type Section | Cloud Hill Quarry, north face 24m, 47m, 54m levels. | ||
Reference(s): | |||
Ambrose, K, and Carney, J N. 1997. Geology of the Breedon on the Hill area. British Geological Survey Technical Report WA/97/42. | |||
Monteleone, P H, 1973. The Carboniferous Limestone of Leicestershire and south Derbyshire. Unpublished PhD thesis, University of Leicester. | |||
Mitchell, G H and Stubblefield, C J, 1991. The Carboniferous Limestone of Breedon Cloud, Leicestershire. Geological Magazine, 78, 201-219. | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
E141 |