The Late Triassic Whistle Creek Sequence underlies most of the property and consists predominantly of westerly dipping andesitic tuffs with minor interbedded clastic sediments and limestone lenses. The Copperfield conglomerate is a limestone boulder conglomerate that is found at the base of the Whistle Creek sequence and overlies the Hedley sequence of interbedded clastic sediments, carbonates and minor tuffs. Jurassic Cahill Creek granodiorite crops out on the eastern part of the claim. Hornblende feldspar porphyry sills, also of Jurassic age, cut the Triassic rocks on the property. The clastic sediments of the Hedley sequence are hornfelsed and have undergone clacic alteration.