The BGS Lexicon of Named Rock Units — Result Details
Shanmullagh Formation
| Computer Code: | SHAN | Preferred Map Code: | SHAN |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Famennian Age (DA) — Famennian Age (DA) | ||
| Lithological Description: | Sandstone, purple-brown, fine- to medium-grained, thin to very thick beds; and purple-red siltstones and mudstone; ripples. | ||
| Definition of Lower Boundary: | Not exposed: unconformable, in the east on Sheet 34 (Pomeroy) on Lower Palaeozoic sediments and on varied igneous/metamorphic lithologies of Tyrone Volcanic Complex (Palaeozoic). | ||
| Definition of Upper Boundary: | Not exposed; overlain unconformably by Lower and Upper Carboniferous sediments. | ||
| Thickness: | Not known; probably >1000m | ||
| Geographical Limits: | The Irvinestown segment of the Fintona Block, Northern Ireland. | ||
| Parent Unit: | Fintona Group (FIN) | ||
| Previous Name(s): | Fintona Beds [Obsolete Name and Code: Use SHAN, FIN]
(-3404)
Ballinamallard Mudstone Formation (BLM) Fintona Group (FIN) Ballinamallard Mudstone Formation (BLM) Fintona Group (FIN) |
||
| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | Numerous superficial deposit-free areas and stream section in Drumharrey Townland, Drumduff Townland, 300m east and 500m east-south-east of the stratotype. | ||
| Type Section | Disused quarry at Shanmullagh West, 2.4km north-north-east of Irvinestown. Exposes particularly arenaceous part of the sequence. | ||
| Reference(s): | |||
| Nolan, J, 1880. On the Old Red Sandstone of the north of Ireland. Quarterly Journal of the Geological Society of London, Vol.36, 529-535. | |||
| House, M R, Richardson, J B, Chaloner, W G, Allen, J R L, Holland, C H and Westoll, T S. 1977. A Correlation of Devonian rocks of the British Isles. Geological Society of London, Special Report No.8, Scottish Academic Press, Edinburgh. | |||
| Mitchell, W I and Owens, B, 1990. The geology of the western part of the Fintona Block, Northern Ireland: Evolution of Carboniferous basins. Geological Magazine, Vol.127 (5), 407-426. | |||
| Mitchell, W I and Owens, B, 1990. Used on 1:50,000 geological maps of the Kesh (Sheet 32) area; to be included in Memoir of the Kesh-Omagh (Sheets 32/33) area, p.411. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| N32 | |||