| Tirnaskea Formation Stratigraphic range: Ordovician | |
|---|---|
| Type | Formation |
| Location | |
| Region | Northern Ireland |
| Country | United Kingdom |
The Tirnaskea Formation is a geologic formation in Northern Ireland. It preserves fossils dating back to the Ordovician period.
Chonetes is an extinct genus of brachiopods. It ranged from the Late Ordovician to the Middle Jurassic.
The Sonyea Group is a geologic group in the northern part of the Appalachian Basin. It preserves fossils dating back to the Devonian period.
The Everton Formation is a geologic formation in northern Arkansas that dates to the middle Ordovician Period. Unconformities separate this formation from the underlying Powell Formation and the overlying St. Peter Sandstone Formation. Named for the town of Everton in Boone County, Arkansas in 1907, the Everton Formation is composed primarily of dolomite, limestone, and sandstone.
The Glencar Formation is a geologic formation in Northern Ireland. It preserves fossils dating back to the Carboniferous period.
The Maydown Limestone is a geologic formation in Northern Ireland. It preserves fossils dating back to the Carboniferous period.
The Carrickaness Sandstone is a geologic formation in Northern Ireland. It preserves fossils dating back to the Carboniferous period.
The Blackwater Limestone is a geologic formation in Northern Ireland. It preserves fossils dating back to the Carboniferous period.
The Blackstokes Limestone is a geologic formation in Northern Ireland. It preserves fossils dating back to the Carboniferous period.
The Bardahessiagh Formation is a geologic formation in Northern Ireland. It has been described from a locality lying about 3 km NNE of Pomeroy, south of Craigbardahessiagh. It is now known as comprising the former ‘Bardahessiagh Formation’, or Bardahessiagh Beds and the ‘Junction Beds’ that is underlain by a stratigraphical unit not recognised, until fieldwork by the Ulster Museum staff in 1992. The Bardahessiagh Formation is divided into three units, but the summit of the formation is not known. Field evidence indicates that the local top of the formation is characterised by a thrust contact with the Killey Bridge and Tirnaskea Formation, exposed south of the Well Field, which lies 650 metres SSW of Craigbardahessiagh.
The Killey Bridge Formation is a geologic formation in Northern Ireland. It preserves fossils dating back to the Ordovician period.
The Booley Bay Formation is a geologic formation in Ireland. It preserves fossils dating back to the Cambrian period.
The Clogrenan Formation is a geologic formation in Ireland. It preserves fossils dating back to the Carboniferous period.
The Naul Formation is a geologic formation in Ireland. It preserves fossils dating back to the Carboniferous period.
The Holmpatrick Formation is a geologic formation in Ireland. It preserves fossils dating back to the Carboniferous period.
The Liscartan Formation is a geologic formation in Ireland. It preserves fossils dating back to the Carboniferous period.
The Kiltorcan Formation is a geologic formation in Ireland. It preserves fossils dating back to the Devonian period.
The Courtown Formation is a geologic formation in Ireland. It preserves fossils dating back to the Ordovician period.
The Mweelrea Formation is a geologic formation in Ireland in the Mweelrea Mountains. It preserves fossils dating back to the Ordovician period.
The Cloonnamna Formation is a geologic formation in Ireland. It preserves fossils dating back to the Silurian period.
The Hollyford Formation is a geologic formation in Ireland. It preserves fossils dating back to the Silurian period.
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