The BGS Lexicon of Named Rock Units — Result Details
Glen Dhoo Formation
| Computer Code: | GLDH | Preferred Map Code: | notEntered |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Tremadoc Series (O1) — Tremadoc Series (O1) | ||
| Lithological Description: | A pale grey mudstone, with a variable proportion of siltstone laminae and sandstone dispersed in thin; sandstone locally predominant in thin to thick-bedded packets; siltstone, massive, dominant locally; minor occurences of andesitic tuff and volcanic breccia | ||
| Definition of Lower Boundary: | Faulted. | ||
| Definition of Upper Boundary: | Faulted contact only with the Ladyport Formation, which is distinguished by a change from a siltstone/sandstone-dominated facies to a mudstone-dominated facies in the Ladyport. | ||
| Thickness: | About 300 m thick. | ||
| Geographical Limits: | Isle of Man. | ||
| Parent Unit: | Manx Group (MANX) | ||
| Previous Name(s): | Glion Cam Unit [Obsolete Name and Code: Use GLDH]
(-282)
Lonan and Niarbyl Flags, Glen Dhoo Flags and Cronkshamerk Slates [Obsolete Name and Code: Use GLDH] (-283) Lonan and Niarbyl Flags [Obsolete Name and Code: Use LNN, GLDH] (-2206) Glion Cam Formation [Obsolete Name and Code: Use CRMR, GLDH] (GLMC) |
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| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | Upper and Glen Dhoo. Chadwick et al., 2001. | ||
| Reference(s): | |||
| 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. | |||
| 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 | |||
| Millward, D, and Stone, P. 2012. Stratigraphical framework for the Ordovician and Silurian sedimentary strata of northern England and the Isle of Man. British Geological Survey Research Report, RR/12/04. 119pp. | |||
| Waters, C N, Gillespie, M R, Smith, K, Auton, C A, Floyd, J D, Leslie, A G, Millward, D, Mitchell, W I, McMillan, A A, Stone, P, Barron, A J M, Dean, M T, Hopson, P M, Krabbendam, M, Browne, M A E, Stephenson, D, Akhurst, M C, and Barnes, R P. 2007. Stratigraphical Chart of the United Kingdom: Northern Britain. (British Geological Survey.) | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E400 | |||