The Hollyford Formation is a rock unit from the Silurian found in the Cratloe Hills, County Clare, Ireland. It is made mainly of mudstone, greywacke, and fine siltstone. These rocks were formed in a deep sea environment, where sediment was carried into the basin by underwater flows called turbidity currents, building up layers over time.
See also
List of fossiliferous stratigraphic units in Ireland
References