Scandal Beck Limestone Formation: Difference between revisions
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Scandal Beck Limestone Formation (SCBL), Carboniferous, Northern England Province
Scandal Beck Limestone Formation is part of the Great Scar Limestone Group
Name
The name was first proposed by Mitchell (1972)[1] and given formation status by Pattison (1990)[2].
Lithology
The Scandal Beck Limestone Formation largely comprises dark grey, fine- to medium-grained, variable but commonly quite thin-bedded, packstone. Interbeds of sandstone, siltstone or mudstone between these fossiliferous limestones are common.
Genetic interpretation
Millward et al. (2003)[3] considered the depositional environment to be a deep water carbonate ramp.
Stratotype
The type area is Scandal Beck (NY.718.040), in the Ravenstonedale area.
Lower and upper and boundaries
The base of the formation is conformable on the the Algal Nodular Beds at the top of Coldbeck Limestone Formation, the latter comprising well bedded limestones with mudstone partings, and flaggy dolostones with algal macrostructures.
A succession of sandstones, oolitic limestones and layers of quartz pebbles, the Brownber Formation (BNBF), conformably overlies the Scandal Beck Limestone Formation in Ravenstonedale (Figure 9, Column 16).
Thickness
The formation is about 120 m thick at Ravenstonedale, thinning to the north-east and south-west. It is about 50 m thick in the Appleby district.
Distribution and regional correlation
The Ravenstonedale area.
Age and biostratigraphical characterisation
Chadian to early Arundian? (see Mitchell, 1978, fig. 60[4], col..D after Taylor et al., 1971[5]; Ramsbottom in Dunham and Wilson, 1985[6], p. 28; George et al., 1976, p. 39, fig. 11:4[7]; Millward et al., 2003, fig. 7[3]). Stratigraphically significant fossils within the formation include the coral Dorlodotia pseudovermiculare.
References
- ↑ Mitchell, M.1972.The base of the Viséan in south-west and north-west England.Proceedings of the Yorkshire Geological Society, Vol. 39, 151–160.
- ↑ Pattison, J.1990.Geology of the Orton and Sunbiggin Tarn districts: 1:10 000 sheets NY60NW and NE.British Geological Survey Technical Report, WA/90/12
- ↑ 3.0 3.1 Millward, D, McCormac, M, Hughes, R A, Entwistle, D C, Butcher, A, and Raines, M G.2003.Geology of the Appleby district.Sheet explantion of the British Geological Survey,Sheet 30 (England and Wales)
- ↑ Mitchell, M.1978.Dinantian.168–177 in The geology of the Lake District. Moseley, F (editor).Occasional Publication of the Yorkshire Geological Society, No. 3
- ↑ Taylor, B J, Burgess, I C, Land, D H, Mills, D A C, Smith, D B, and Warren, P T.1971.British regional geology: northern England (4th edition). (London: HMSO for Institute of Geological Sciences.)
- ↑ Dunham, K C, and Wilson, A A.1985.Geology of the Northern Pennine Orefield: Volume 2, Stainmore to Craven.Economic Memoir of the British Geological Survey, Sheets 40, 41 and 50, parts 31, 32, 51, 60 and 61(England and Wales)
- ↑ George, T N, Johnson, G A L, Mitchell, M, Prentice, J E, Ramsbottom, W H C, Sevastopulo, G D, and Wilson, R B.1976.A correlation of Dinantian rocks in the British Isles.Geological Society of London Special Report, No.7.