The BGS Lexicon of Named Rock Units — Result Details

Manx Group

Computer Code: MANX Preferred Map Code: notEntered
Status Code: Full
Age range: Tremadoc Series (O1) — Arenig Series (OR)
Lithological Description: A typically dark grey to black mudstone, commonly with pale siltstone laminae and sandstone dispersed as thin to medium beds; locally predominant thin- to thick-bedded, wacke and quartz arenite sandstone, and debrite (pebbly mudstone), which is well-developed in places.
Definition of Lower Boundary: Not seen.
Definition of Upper Boundary: Stratigraphical boundaries not seen, the top is probably unconformiable with the Dalby Group against which exposed contacts are elsewhere faulted. It is distinguished by a change from a mudstone-dominated facies in the Manx Group to a sandstone-dominated facies in Dalby Group.
Thickness: At least 3000 m thick..
Geographical Limits: Isle of Man.
Parent Unit: Not Applicable (-)
Previous Name(s): Manx Slate Group [Obsolete Name And Code: See MANX] (MXS)
Manx Slates [Obsolete Name And Code: See MANX] (MXSL)
Manx Slate Series (-3975)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Laxey Bay 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:
E400