Computer Code: |
TYRO |
Preferred Map Code: |
TYRO |
Status Code: |
Full |
Age range: |
Courceyan Substage (CF)
— Asbian Substage (CR) |
Lithological Description: |
Mixed sequence of thin basal (red-bed) clastics, marine limestones (with mud mounds) and shales/mudstones; thin deltaic horizons. NOTE: Reference Sections: see component formations: Daltry, Glancar, Ballyshannon, Termon River Limestone, Tubbrid, Mullaghmore, Bin Mountain, Claragh Sandstone, Benbulben, Bundoran, Keeneghan Shale and Drumchorick Siltstone formations. |
Definition of Lower Boundary: |
Unconformable on metamorphic basement or Courceyan Omagh Sandstone Group. |
Definition of Upper Boundary: |
Overlain disconformably by predominantly shale sequence of the Leitrim Group. |
Thickness: |
To 2400m |
Geographical Limits: |
The northwest Carboniferous basin of Ireland. |
Parent Unit: |
Not Applicable (-)
|
Previous Name(s): |
none recorded or not applicable
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
Type Area |
Southwest part of County Tyrone in the area of the Clogher Valley, centred on 10km Grid Square H24 34. |
Type Area |
South and west County Fermanagh in area of Fermanagh Highlands, centred on 10km Grid Square H21 34. |
Reference(s): |
Brandon, A. 1977. The Meenymore Formation: an extensive intertidal evaporitic formation in the Upper Visean (B2) of north-west Ireland. Report of the Institute of Geological Sciences, No.77/23, p.14. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
N35
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