At the Nordstrum showing, three phosphate beds, each approximately 1 metre thick, are exposed across a width of 60 metres. Host lithologies are siltstone and fine sandstone of the Permian Johnson Canyon Formation (Ishbel Group). Phosphate is present as nodules, pellets and cement. The most westerly bed contains 21.20 per cent P2O5 across a width of 1 metre. The two easterly beds contain 5 per cent phosphate nodules by volume (Open File 1987-16).