The BGS Lexicon of Named Rock Units — Result Details
Holly Bush Member
Computer Code: | HYBH | Preferred Map Code: | HyB |
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Status Code: | Full | ||
Age range: | Chadian Substage (CI) — Chadian Substage (CI) | ||
Lithological Description: | Fine to coarsely crystalline sandy dolostone, dolomitic sandstones and dolomites with thin stylolitic shaly mudstone and clay partings. | ||
Definition of Lower Boundary: | The incoming of common beds of sandy dolostone/dolomitic sandstone in the Milldale Limestone. | ||
Definition of Upper Boundary: | In the type section the top is taken at the top of the highest sandy dolomite, here additionally containing derived pebbles. The member is suceeded by grey, medium to thickly-bedded dolostones of the undivided Milldale Limestone Formation. | ||
Thickness: | 0-61m | ||
Geographical Limits: | Only known in Cloud Hill Quarry. | ||
Parent Unit: | Milldale Limestone Formation (MI) | ||
Previous Name(s): | Carboniferous Limestone [Obsolete Name and Code: Use CL]
(-4550)
Cloud Hill Dolomite Formation [Obsolete Name and Code: Use HYBH, CLHD] (-133) |
||
Alternative Name(s): | none recorded or not applicable | ||
Stratotypes: | |||
Type Section | Cloud Hill Quarry, southern face of 4m quarry level. | ||
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. | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
E141 |