The BGS Lexicon of Named Rock Units — Result Details

Chee Tor Limestone Member

Computer Code: CT Preferred Map Code: CT
Status Code: Full
Age range: Asbian Substage (CR) — Asbian Substage (CR)
Lithological Description: A homogeneous, massive to thickly bedded, pale grey to grey calcarenite. Bed boundaries are typically defined by stylolitic or clay partings, with beds generally ranging from 0.5 to 5.0m, up to a maximum of 10.2m thick. Rare calcilutites or very fine calcarenites occur in the basal 13m, where beds tend to be thinner.
Definition of Lower Boundary: Taken at the conformable transition from the top of the highest dark micritic or calcilutitic bed of the Woo Dale Limestone Formation to the pale grey to grey calcarenite with rare calcilutites or very fine calcarenites of the Chee Tor Limestone Member.
Definition of Upper Boundary: Calcarenites of the Chee Tor Limestone Member are overlain by basaltic lavas of the Lower Miller's Dale Lava Member.
Thickness: Average thickness is 120m
Geographical Limits: Positive identification of rocks assigned to the Member is restricted to the area around Buxton and the valley of the River Wye.
Parent Unit: Bee Low Limestone Formation (BLL)
Previous Name(s): Chee Tor Rock Member [Obsolete Name and Code: Use CT] (-174)
Chee Tor Rock (-827)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Partial Type Section  Below Cowdale Quarry: the 12.88m-thick basal section of the member is exposed overlying the Woo Dale Limestone Formation. Aitkenhead et al., 1985. 
Partial Type Section  Cowdale Quarry exposes a 50.48m-thick section entirely within the Member. Aitkenhead et al., 1985. 
Partial Type Section  The cliff of Chee Tor above the River Wye exposes 47m of massive limestone from the basal part of the Member. Aitkenhead et al., 1985. 
Partial Type Section  Tunstead Quarry exposes a 116m-thick succession of the Chee Tor Limestone Member and its junction with the underlying Woo Dale Limestone Formation. Stevenson and Gaunt, 1971. 
Reference(s):
Cope, F W. 1933. The Lower Carboniferous succession in the Wye Valley region of North Derbyshire. Journal of the Manchester Geological Association, Vol.1, 125-145. 
Green, A H, Foster, C N and Dakyns, J R. 1869. The Geology of the Carboniferous Limestone, Yoredale Rocks and Millstone Grit of North Derbyshire. Memoir of the Geological Survey, England and Wales. 
Stevenson, I P and Gaunt, G D, 1971. Geology of the country around Chapel-en-le-Frith. Memoir of the Geological Survey of Great Britain, England and Wales, Sheet 99. 
Aitkenhead, N, Chisholm, J I, and Stevenson, I P. 1985. Geology of the country around Buxton, Leek and Bakewell. Memoir of the British Geological Survey, England and Wales Sheet 111. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E099 E111