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, 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. | |||
| 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 | |||