Croughaun Hill ( or ''Cruachán'') is a hill in north

County Waterford County Waterford () is a Counties of Ireland, county in Republic of Ireland, Ireland. It is in the Provinces of Ireland, province of Munster and is part of the Southern Region, Ireland, Southern Region. It is named after the city of Waterford. ...

, Ireland. It is a largely solitary hill to the east of the

Comeragh Mountains The Comeragh Mountains () are a glaciated mountain range situated in southeast Ireland in County Waterford and County Tipperary. They are located between the town of Dungarvan and stretch inland to the town of Clonmel on the County Tipperary bo ...

Geography

The hill has a conical shape, and is geologically composed of conglomerates,

sandstone Sandstone is a Clastic rock#Sedimentary clastic rocks, clastic sedimentary rock composed mainly of grain size, sand-sized (0.0625 to 2 mm) silicate mineral, silicate grains, Cementation (geology), cemented together by another mineral. Sand ...

and

siltstone Siltstone, also known as aleurolite, is a clastic sedimentary rock that is composed mostly of silt. It is a form of mudrock with a low clay mineral content, which can be distinguished from shale by its lack of fissility. Although its permeabil ...

which are dated to the

Devonian The Devonian ( ) is a period (geology), geologic period and system (stratigraphy), system of the Paleozoic era (geology), era during the Phanerozoic eon (geology), eon, spanning 60.3 million years from the end of the preceding Silurian per ...

period. Villages in the surrounding hinterland include Fews, Clonea-Power and Rathgormack.

References

Mountains and hills of County Waterford {{Waterford-geo-stub