The BGS Lexicon of Named Rock Units — Result Details

Ecton Limestone Formation

Computer Code: ECL Preferred Map Code: notEntered
Status Code: Full
Age range: Asbian Substage (CR) — Brigantian Substage (CX)
Lithological Description: The lower part of the formation is dominated by thinly to thickly bedded, brownish-grey, finely bioclastic and peloidal to conglomeratic limestone, containing chert nodules and mudstone partings, in sharp based, poorly graded turbiditic beds. In the middle, thinly bedded and laminated dark grey micritic limestone passes up into thicker bedded limestone. The upper part of the formation, includes dark grey fine-grained limestone, and coarser-grained, sharp-based graded beds of turbiditic origin.
Definition of Lower Boundary: The base of thicker-bedded, paler grey peloidal and crinoidal bioclastic limestone above dark grey, thinly-bedded, fine-grained limestones of the Milldale Limestone Formation.
Definition of Upper Boundary: A transitional conformable base taken at the lowest thick grey mudstone of the Widmerpool Formation, above grey limestones of the Ecton Limestone Formation.
Thickness: From 225m in the type area, increasing to a maximum of 258m proved around Grindon [SK 093 541].
Geographical Limits: The Dovedale-Manifold Valley, and the southwestern part of the Peak District inlier [SK 09 60] to [SK 13 48], Derbyshire and Staffordshire.
Parent Unit: Craven Group (CRAV)
Previous Name(s): Apestor Limestones [Obsolete Name And Code: See ECL] (APSL)
Apestor Limestone (-2776)
Ecton Limestones Formation (-2166)
Mixon Limestones [Obsolete Name And Code: Use ECL] (MXL)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Partial Type Section  The Manifold Light Railway track (disused) near Ecton, exposes the basal 108m of the Formation. 
Reference Section  The Grindon Borehole (SK05SE/19) proved 124m of the lower part of the Formation. 
Reference(s):
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. 
Chisholm, J I, Charsley, T J and Aitkenhead, N. 1988. Geology of the country around Ashbourne and Cheadle. Memoir of the British Geological Survey, Sheet 124 (England and Wales). 
Aitkenhead, N and Chisholm, J I. 1982. A standard nomenclature for the Dinantian formations of the Peak District of Derbshire and Staffordshire. Report of the Institute of Geological Sciences, No.82/8. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E111 E124