At the Sheep Mountain showing, a 10 to 15 centimetre thick phosphate-cemented chert pebble conglomerate containing 13.8 per cent P2O5, unconformably overlies dolomitic siltstone of the Pennsylvanian Kananaskis Formation (Spray Lakes Group). This conglomerate is overlain by a phosphatic cherty sandstone bed 70 centimetres thick that contains 0.7 per cent P2O5 (Open File 1987-16), and which belongs to the Permian Johnson Canyon Formation (Ishbel Group).