The BGS Lexicon of Named Rock Units — Result Details

Appleby Group

Computer Code: APY Preferred Map Code: APY
Status Code: Full
Age range: Permian Period (P) — Permian Period (P)
Lithological Description: Red, aeolian cross-bedded millet-seed sandstone, fluviatile sandstone and breccias ('Brockram') interbedded in varying proportions. In the Collyhurst Sandstone and correlatives grey, white and pale brown colours are also common and breccias are rare. Some interbedded red mudstones are present locally. NOTE: Group includes Penrith Sandstone, Brockram, Rougholme Point Conglomerate, Collyhurst Sandstone, Lockarbriggs Sandstone Formation and Dowell Breccia Formation.
Definition of Lower Boundary: Strongly unconformable mainly on a range of Carboniferous strata, locally on older formations.
Definition of Upper Boundary: Taken at point in sequence where sandstone becomes subordinate to mudstones, siltstones, carbonates and evaporites of the overlying Cumbrian Coast Group (St Bees Evaporites or Manchester Marls formations).
Thickness: Typically shows large variations over short distances.
Geographical Limits: Extends from northern part of Solway Basin in the north to northeast part of Cheshire Basin in the south and at least as far west as the Isle of Man and the eastern Irish Sea (Jackson and others, 1987).
Parent Unit: Not Applicable (-)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Reference Section  Formby No.1 Borehole SD30NW/22- Collyhurst Sandstone Formation. Top of Formation and Group at 1078.99m. Base of Formation and Group at 1793.75m. Oil test well 914m north of Formby's Farm, Downholland Moss, Formby, Lancashire. (Falcon and Kent,1960, p33.) 
Type Area  Appleby, Vale of Eden: General Vale of Eden area of Cumbria including Penrith, Appleby and Kirkby Stephen. 
Type Section  (Here chosen and defined) in Penrith Sandstone Formation. Hilton Beck c.3 km east of Appleby beginning 300m north of Ellerholme. (Burgess and Holliday, 1979, p.70). 
Falcon, N L and Kent, P. 1960. Geological results of petroleum exploration in Britain, 1945-1957. Geological Society of London, Memoir, 2, 1-56. 
Arthurton, R S, Burgess, I C and Holliday, D W, 1978. Permian and Triassic. "In" The geology of the Lake District, Yorkshire Geological Society Occasional Publication, Vol.3, p. 189-206. W.S. Maney and Son Ltd; Leeds. 
Wray, D A and Cope, F W, 1948. Geology of Southport and Formby. Memoir of the Geological Survey of Great Britain, Sheets 74 and 83 (England and Wales). 
Burgess, I C and Holliday, D W. 1979. Geology of the country around Brough-under-Stainmore. Memoir for 1:50 000 geological sheet 31 and parts of sheets 25 and 30. Geological Survey of Great Britain (England and Wales). [London: HMSO.] 131pp. 
Smith, D B, Brunstrom, R G W, Manning, D I, Simpson, S and Shotton, F W. 1974. A correlation of Permian rocks in the British Isles. Geological Society of London Special Report No. 5. 
Aitkenhead, N. 1992. Geology of the area between Halton and Carnforth. British Geological Survey Technical Report, WA/92/27. 
Poole, E G, and Whiteman, A J. 1955. Variations in the thickness of the Collyhurst Sandstone in the Manchester area. Bulletin of the Geological Survey of Great Britain, No. 9, 33-41. 
Jackson, D I, Mulholland, P, Jones, S M and Warrington, G, 1987. The geological framework of the East Irish Sea Basin. 191-203 in Brooks J and Glennie, K (editors), Petroleum Geology of North West Europe. [Graham and Trotman.] 
Brookfield, M E, 1978. Revision of the Stratigraphy of Permian and Supposed Permian Rocks of Southern Scotland. Geologische Rundschau, Vol.67, p.110-143. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E059 S006 E048