At the Upper Mutz Creek showing, phosphatic chert and nodular phosphatic sandstone occur in two beds 40 to 50 centimetres thick and 10 to 20 centimetres thick separated by 1 to 2 metres of non-phosphatic sandstone. The best assay obtained was 0.53 per cent P2O5 across a width of 40 centimetres (Open File 1987-16). This phosphate occurs within 25 metres of the bottom of the Triassic Sulphur Mountain Formation (Spray River Group). Bedding is overturned in this area.