The BGS Lexicon of Named Rock Units — Result Details

Chatburn Limestone Formation

Computer Code: CHL Preferred Map Code: ChL
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)
Alternative Name(s): HAW BANK LIMESTONE
Type Area  Quarries west of Chatburn, Lancashire, expose the upper 393m of the Formation. 
Reference Section  The Swinden No.1 Borehole (SD85NE/15) near Horton, Lancashire proved a thickness of 682.5m from the lower part of the Formation. 
Reference Section  Exposure in the Chatburn Bypass road cutting (A59), east side, immediately east of Chatburn village, Lancashire. 
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. 
Whittard, W F and Simpson, S (editors). 1960. Lower Carboniferous "in" Lexique Stratigraphique International, Part 3A VII, Vol.1, p.91. 
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). 
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). 19-25. 
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