The BGS Lexicon of Named Rock Units — Result Details

Injebreck Formation

Computer Code: IBK 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 quartz arenite sandstone as thin to medium beds locally forming packets up to several tens of metres; debrite (pebbly mudstone) locally in the south becoming extensive in the north.
Definition of Lower Boundary: In stratigraphical contact with the Barrule Formation.at the base, which is marked by a change from a mudstone-dominated to a mudstone/sandstone facies
Definition of Upper Boundary: In stratigraphical contact with the Glen Rushen Formation, which is marked by a change from amudstone/sandstone facies to a mudstone-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 And Sulby Slump Breccia (-2860)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Partial Type Section  Lag ny Keeilley to Con Shellagh. Woodcock et al., 1999. 
Partial Type Section  Da Leura to Gob ny Ushtey. Woodcock et al., 1999. 
Reference(s):
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. 
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). 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E400