The BGS Lexicon of Named Rock Units — Result Details

Hope Beck Formation

Computer Code: HBE Preferred Map Code: Hbe
Status Code: Full
Age range: Arenig Series (OR) — Arenig Series (OR)
Lithological Description: Dark grey siltstone and mudstone in laminated and very thin beds, with up to 5% sandstone mainly in thin and medium beds; sporadic pebbly mudstone beds are also present.
Definition of Lower Boundary: Not exposed.
Definition of Upper Boundary: Taken at junction with the overlying Loweswater Formation.
Thickness: 600 to 800m
Geographical Limits: Occurs within the Skiddaw inlier in the vicinity of Hope Beck and on the east side of Dodd. It is not recognised in any other inlier.
Parent Unit: Skiddaw Group (SKG)
Previous Name(s): Hope Beck Slates (-1588)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  The vicinity of Hope Beck and the east flank of Dodd. Cooper et al, 1995. 
Reference(s):
Cooper, A H. 1986. Excursion to the Skiddaw Group, Hope Beck. Proceedings of the Cumberland Geological Society, 4/4, 419-420. 
Fortey, N J, 1989. Low grade metamorphism in the Lower Ordovician Skiddaw Group of the Lake District, England. Proceedings of the Yorkshire Geological Society, Vol.47(4), 325-337. 
Rushton A W A. 1988. Tremadoc trilobites from the Skiddaw Group in the English Lake District. Palaeontology, Vol.31(3), 677-698. 
Webb, B C and Cooper, A H. 1988. Slump folds and gravity slide structures in a Lower Palaeozoic marginal basin sequence (the Skiddaw Group), NW England. Journal of Structural Geology, Vol.10(5), 463-472. 
Cooper, D C, Lee, M K, Forty, N J, Cooper, A H, Rundle, C C, Webb, B C and Allen, P M. 1988. The Crummock Water Aureole: a zone of metasomatism and source of ore metals in the English Lake District. Journal of the Geological Society, Vol.145(4), 523-540. 
Jackson, D E. 1978. The Skiddaw Group. 79-98 in Moseley, F (Ed.), The Geology of the Lake District. Yorkshire Geological Society, Occasional Publication, No.3. 
Cooper, A H, Rushton, A W A, Molyneux, S G, Hughes, R A, Moore, R M and Webb, B C. 1995. The stratigraphy,correlation, provenance and palaeogeography of the Skiddaw Group (Ordovician) in the English Lake District. Geological Magazine, Vol.132(2), 185-211. 
Simpson, A. 1967. The stratigraphy and tectonics of the Skiddaw Slates and the relationship of the overlying Borrowdale Volcanic Series in part of the Lake District, Geological Journal, Vol.5, 391-418. 
Jackson, D E. 1961. Stratigraphy of the Skiddaw Group in Cumberland, England. Geological Magazine, Vol.98, 515-528. 
Rose, W C C. 1955. The sequence and structure of the Skiddaw Slates of the Lake District in the Keswick-Buttermere area. Proceedings of the Geological Association, Vol.65, 403-406 
Eastwood, T. 1933. In Summ. Prog. Geological Survey of Great Britain for 1932. Pt 1, p.59. 
Dixon, E E L. 1925. In Summ. Prog. Geological Survey of Great Britain for 1924, 70-71. 
Ward, J C. 1876. The geology of the northern part of the English Lake District. Memoir of the Geological Survery of Great Britain. 132. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E029 E022 E023