Omagh Thrust

Geological map of Ireland. The red line marks the Omagh Thrust Fault.

The Omagh Thrust Fault is a geological fault in County Tyrone. It is of one of the most important structural discontinuities in Northern Ireland^[1] and an extension of the Highland Boundary Fault which runs through Scotland.^[2]

The fault occurred in the Caledonian orogeny, during a late stage of this period of mountain building. Older sequences of Dalriadan metamorphic strata were moved over younger Ordovician ones with the fault as their boundary.

There is access to a view of the fault at Mountfield Quarry, County Tyrone. This has been designated an Area of Special Scientific Interest.^[1]

References

General references

Map sheet 44 (and accompanying memoir) of the series of 1:50,000 scale geological maps of Northern Ireland published by Geological Survey of Northern Ireland.
Lyle, P. 2003 Classic geology in Europe 5 The north of Ireland Terra Publishing, Harpenden

Geology of Northern Ireland

Volcanism	Antrim plateau Benevenagh Black Mountain Cavehill Divis Donald's Hill Giant's Causeway Murlough Bay Rathlin Island

Volcanic plugs	Carrick a Rede Scawt Hill Slemish Slieve Gallion Slieve Gullion Tievebulliagh

Dykes and Sills	Fair Head Ring of Gullion The Maidens The Skerries

Metamorphic	Benbradagh Loughermore Mourne Mountains Mullaghcarn Mullaghmore Sawel Mountain Slieve Bearnagh Slieve Binnian Slieve Commedagh Slieve Croob Slieve Donard Slieve Gallion Slieve Muck Sperrins

Sedimentary	Belmore Mountain Benaughlin Mountain Cuilcagh Hibernian Greensands Group Islandmagee Magheramorne Marble Arch Caves Slieve Rushen Ulster White Limestone Group Waterloo Bay

Lists	Geological faults of Northern Ireland

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