The Mount Ludington occurrence lies on the east flank of Mount Ludington, approximately 130 kilometres north of the town of MacKenzie.

Regionally, the area is underlain a series of north-northwest trending sedimentary units comprised of limestone, slate, siltstone and argillite of the Triassic Ludington, Baldonnel, Pardonet, Toad and Grayling formations. To the east and west of the previous units, chert, siliceous argillite and siliciclastic rocks of Carboniferous to Permian age are exposed.

A 135-metre measured section of Middle Triassic Toad Formation black, very carbonaceous, quartzose and dolomitic siltstone and silty shale hosts phosphate nodules, phosphate-cemented siltstone, phosphatic lenticles and phosphatic fossil debris. Phosphate nodules are black, ovoid to spherical, 1 to 3 centimetres in diameter and comprise 5 to 20 per cent of the rock by volume. The nodules stand out in relief on weathered surfaces. Individual nodule-bearing units rarely exceed 1 or 2 metres in thickness. The lower part of the phosphate-bearing sequence is marked by the presence of large calcareous concretions and the upper limit by a change to less carbonaceous and more carbonate-rich strata.