The BGS Lexicon of Named Rock Units — Result Details

Creggan Mooar Formation

Computer Code: CRMR Preferred Map Code: notEntered
Status Code: Full
Age range: Arenig Series (OR) — Arenig Series (OR)
Lithological Description: A dark grey mudstone, with pale siltstone laminae and sandstone [quartz arenite] as thin to medium beds, distinctive manganiferous ironstone laminae.
Definition of Lower Boundary: In stratigraphical contact at the base with the Glen Rushen Fornmation, which is marked by a change from a mudstone-dominated facies to a mudstone/sandstone facies with manganiferous ironstone beds;.
Definition of Upper Boundary: The top is faulted against the Dalby Group of the Niarbyl Fm, which is marked by a change from a mudstone/sandstone facies with manganiferous ironstone beds to a sandstone-dominated facies.
Thickness: About 500 m thick.
Geographical Limits: Isle of Man.
Parent Unit: Manx Group (MANX)
Previous Name(s): Manx Group Undivided And Agneash Grits (-3328)
Maughold Banded Group (-2687)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Gob ny Gamera. Woodcock et al., 1999 
Reference Section  Coast section Fheustal to Niarbyl. Woodcock et al., 1999 
Reference(s):
Chadwick, R A, Jackson, D I, Barnes, R P, Kimbell, G S, Johnson, H, Chiverell, R C, Thomas, G S P, Jones, N S, Riley, N J, Pickett, E A, Young, B, Holliday, D W, Ball, D F, Molyneux, S G, Long, D, Power, G M and Roberts, D H. 2001. Geology of the Isle of Man and its offshore area. British Geological Survey Research Report, RR/01/06. 
Geological Survey. 1898. Isle of Man. Sheet 36,45,46 and 57. Solid and Drift geology. 1:63 360 scale. Reprinted at 1:50 000 scale by Institute of Geological Sciences 1975 (Southampton: Ordnance Survey). 
Lamplugh G W. 1903. The geology of the Isle of Man. Memoir Geological Survey of Great Britain 
Simpson A. 1963. The stratigraphy and tectonics of the Manx Slate Series. Quarterly Journal of the Geological Society of London, Vol. 119, 367-400 
Woodcock N H, Morris J H, Quirk D G, Barnes R P, Burnett D, Fitches W R, Kennan P S and Power G M. 1999. Revised lithostratigraphy of the Manx Group, Isle of Man. 45-68 in 'In sight of the suture' the Palaeozoic geology of the Isle of Man in its lapetus Ocean context. Woodcock N H, Fitches W R, Quirk D G and Barnes R P [editors]. Geological Society of London, Special Publication No. 160. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable