A 50 centimetre thick phosphorite bed containing 18.6 per cent P2O5 underlies a 15 metre thick chert horizon in the upper part of the Permian Ranger Canyon Formation (Ishbel Group) (Open File 1987-16). Below the phosphorite are 2.5 metres of phosphatic siltstone and chert containing 0.2 to 3.8 per cent P2O5 across widths of 0.3 and 1.3 metres respectively. In this section phosphate is in the form of ovoid nodules with the upper part of the phosphorite being massive phosphate.

The strata in the Forsyth Creek North showing area is vertically dipping and strikes north.