The BGS Lexicon of Named Rock Units — Result Details

Maughold Formation

Computer Code: MGD 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 sparse sandstone in thin-to thick beds.
Definition of Lower Boundary: Stratigraphical contacts at the base with the Creg Agneash and Mull Hill fms. It is distinguished by a transition from sandstone-domainated to mudstone-dominated facies.
Definition of Upper Boundary: The top is faulted against the Barrule Fm, from which it is distinguished by a lack of any sandstone or siltstone in the latter.
Thickness: From 500 to 600 m thick.
Geographical Limits: Isle of Man.
Parent Unit: Manx Group (MANX)
Previous Name(s): Manx Group Undivided (-4792)
Maughold Banded Formation [Obsolete Name And Code: See MGD] (MBF)
Maughold Banded Group (-2687)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Port Lewaigue. 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