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):
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. 
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. 
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. 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E029 E022 E023