The BGS Lexicon of Named Rock Units — Result Details

Hopedale Limestone Formation

Computer Code: HP Preferred Map Code: notEntered
Status Code: Full
Age range: Asbian Substage (CR) — Brigantian Substage (CX)
Lithological Description: A heterogeneous succession of typically mid grey, locally dark grey, fine- to coarse-grained calcarenites, with limestone clasts and coarse crinoid debris common at the base of the Formation, and in the vicinity of knoll-reefs.
Definition of Lower Boundary: Upward change from dark cherty micritic limestone of the underlying Milldale Limestone Formation, to grey, coarsely bioclastic or conglomeratic limestones present at the base of the Hopedale Limestone Formation.
Definition of Upper Boundary: In the upper part, seen as mostly calcarenites, with a sharp change to darker mudstones at the base of the Widmerpool Formation.
Thickness: 60m in Hopedale [SK 129 549], to 300m around Gag Lane, to the northnortheast of Thorpe [SK 16 51].
Geographical Limits: Southern part of the Peak District, Derbyshire and Staffordshire.
Parent Unit: Peak Limestone Group (PKLM)
Previous Name(s): Narrowdale Limestone [Obsolete Name And Cose: Part Of HP] (NDL)
Hopedale Limestones (-962)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Disused quarry, north of Wetton, shows 10.9m of fossiliferous bioclastic and conglomeratic limestone near the flank of a knoll reef. 
Reference Section  Brownend Quarry, Waterhouses, exposes 8.26m at the base of the Formation, and the boundary with the underlying Milldale Limestone Formation. 
Reference Section  Disused quarries east of Leehouse Farm, Waterhouses, expose 80.8m of beds in the upper part of the Formation. 
Reference(s):
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. 
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:
E111 E124