The BGS Lexicon of Named Rock Units — Result Details
Chatburn Limestone Formation
Computer Code: | CHL | Preferred Map Code: | ChL |
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Status Code: | Full | ||
Age range: | Courceyan Substage (CF) — Chadian Substage (CI) | ||
Lithological Description: | Well-bedded, mostly grey to dark grey packstone limestones with chert lenses and subordinate partings or thin beds of shaly calcareous mudstone and siltstone. | ||
Definition of Lower Boundary: | Not exposed or proved. | ||
Definition of Upper Boundary: | Taken where the dominant lithology described above, passes conformably upwards into either the dark shale-with-limestone lithology of the undifferentiated Craven Group in basinal areas, or into the paler, "more coarsely bioclastic and cleaner washed" limestone of the Clitheroe Limestone Formation on the Bowland High. | ||
Thickness: | At least 838m measured thickness (base not proved). | ||
Geographical Limits: | Widespread across the Craven Basin from the Whitewell area [SD64] in the west to the Skipton/Broughton area [SD95] in the east, where it includes the Haw Bank Limestone (q.v.). | ||
Parent Unit: | Bowland High Group (BOHI) | ||
Previous Name(s): | Chatburn Limestone Group [Obsolete Name and Code: Use CHL]
(-2695)
Haw Bank Limestone [Obsolete Name and Code: Use CHL] (*631) |
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Alternative Name(s): | none recorded or not applicable | ||
Stratotypes: | |||
Reference Section | The Swinden No.1 Borehole (SD85SE/15) near Horton, Lancashire proved a thickness of 682.5 m from the lower part of the Formation. Charsley, 1983. | ||
Reference Section | Exposure in the Chatburn Bypass road cutting (A59), east side, immediately east of Chatburn village, Lancashire. For other sections, see Whittard and Simpson, 1960, and Earp and others, 1961. | ||
Type Area | Quarries west of Chatburn, Lancashire, expose the upper 393m of the Formation. Earp et al.,1961 | ||
Reference(s): | |||
Whittard, W F and Simpson, S (editors). 1960. Lower Carboniferous "in" Lexique Stratigraphique International, Part 3A VII, Vol.1, p.91. | |||
Hudson, R G S and Mitchell, G H, 1937. The Carboniferous geology of the Skipton Anticline. Geological Survey of Great Britain, Summary of Progress for 1935, part 2, p.1-45. | |||
Earp, J R, Magraw, D, Poole, E G, Land, D H and Whiteman, A J, 1961. Geology of the country around Clitheroe and Nelson. Memoir of the Geological Survey of Great Britain, Sheet.68, England and Wales, pp.346. | |||
Waters, C N, Waters, R A, Barclay, W J, and Davies, J R. 2009. Lithostratigraphical framework for Carboniferous successions of Southern Great Britain (Onshore). British Geological Survey Research Report, RR/09/01. 184pp. | |||
Arthurton, R S, Johnson, E W, and Mundy, D J C. 1988. Geology of the country around Settle. Memoir of the British Geological Survey, Sheet 60 (England and Wales). | |||
Charsley, T J. 1983. Early Carboniferous rocks of the Swinden No.1 Borehole, west of Skipton, Yorkshire. BGS Reports, Vol.16, No.1, 5-12. | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
E069 E061 E060 E067 E068 E059 |