Earth Science Conservation Review
| Mveela More | Tyrone |
| Site Type: | Inland exposure |
| Site Status: | ESCR |
| Grid Reference: | H641792 |
| Google maps: | 54.6573,-7.00679 |
| Rocks | |
|---|---|
| Rock Age: | Ordovician |
| Rock Name: | Tyrone Volcanic Group, Copney Pillow-lava Formation |
| Rock Type: | Basalt, Breccia, Volcanic, Chert |
| Interest | |
| Minerals: | Epidote, Pyrite |
| Other interest: | Caledonian, mineral vein, pillow lava, Extrusion |
Introduction:
Mveela More is a compact site locate just north of the main Omagh to Cookstown Road (A505) 2km east northeast of Creggan. One of the earliest geological maps covering this area, Portlock (1843) classified all the volcanic and plutonic rocks of central Tyrone together as, "metamorphic rocks of hornblendic type" clearly distinguishing them from the mica schists of the Sperrin Mountains and the Tyrone Central Inlier. The rocks at Mveela More (Miveel Rock on the Portlock map) were classified as "trap".
On the first edition of the one-inch to the mile scale geological map (Sheet 26, Draperstown, Geological Survey of Ireland, 1882) Mveela More was mapped as "pyroxenic rocks" designated as "Probably of Pre-Cambrian or Upper Laurentian Age". In the memoir, which accompanied the map, Nolan (1884) referred to Mveela More as being composed of "a very compact rock that is cellular in parts, the original cavities being filled with carbonates".
The earliest detailed geological map and description of the geology of the central Tyrone Ordovician volcanic plutonic terrane was by Hartley (1933). Hartley included the rocks at Mveela More within what he referred to as the Tyrone Igneous Series.
The second editions of geological Sheet 34 (Pomeroy) and Sheet 26 (Draperstown) (Geological Survey of Northern Ireland, 1979, 1995) included revised stratigraphy for the of the Ordovician igneous rocks in Central Tyrone. The volcanic rocks including those at Mveela More were included within the Tyrone Volcanic Group. More recently, the Tyrone Volcanic Group together with the closely associated Tyrone Plutonic Complex Volcanic Group have been interpreted as part of an ophiolite complex, (Hutton et al., 1985). On a regional scale, these rocks form part of the Tyrone-Girvan Sub-Terrane of the Midland Valley Terrane (Bluck, 1992).
On the first edition of the one-inch to the mile scale geological map (Sheet 26, Draperstown, Geological Survey of Ireland, 1882) Mveela More was mapped as "pyroxenic rocks" designated as "Probably of Pre-Cambrian or Upper Laurentian Age". In the memoir, which accompanied the map, Nolan (1884) referred to Mveela More as being composed of "a very compact rock that is cellular in parts, the original cavities being filled with carbonates".
The earliest detailed geological map and description of the geology of the central Tyrone Ordovician volcanic plutonic terrane was by Hartley (1933). Hartley included the rocks at Mveela More within what he referred to as the Tyrone Igneous Series.
The second editions of geological Sheet 34 (Pomeroy) and Sheet 26 (Draperstown) (Geological Survey of Northern Ireland, 1979, 1995) included revised stratigraphy for the of the Ordovician igneous rocks in Central Tyrone. The volcanic rocks including those at Mveela More were included within the Tyrone Volcanic Group. More recently, the Tyrone Volcanic Group together with the closely associated Tyrone Plutonic Complex Volcanic Group have been interpreted as part of an ophiolite complex, (Hutton et al., 1985). On a regional scale, these rocks form part of the Tyrone-Girvan Sub-Terrane of the Midland Valley Terrane (Bluck, 1992).
| Enlander, I., Dempster, M. & Doughty, P., 2024. Mveela More, County Tyrone, site summary. [In] Earth Science Conservation Review. https://www.habitas.org.uk/escr/summary.php?item=582. Accessed on 2024-12-26 |
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