The Croisaphuill Formation is a geological formation in Scotland. It preserves fossils dating back to the Ordovician period.
See also List of fossiliferous stratigraphic units in Scotland
References
Further reading D.H. Evans. 2011. The Lower Ordovician cephalopod faunas of the Durness Group, North-West Scotland. Monograph of the Palaeontographical Society, London 165:1-131