The Chris claim group is situated on the axis of the American Creek anticline: an open, slightly inclined regional fold of Unuk River (Hazelton assemblage) and Betty Creek (Bowser assemblage) volcanic, volcaniclastic and sedimentary rocks. The property is almost entirely underlain by Lower Jurassic, red and green volcanic conglomerates and sandstones of the Unuk River Formation. Middle Jurassic volcanic conglomerates, breccias and crystal and lithic tuffs of the Betty Creek Formation unconformably overlie the Unuk River rocks on the west side of the property. The Chris claim group is bisected by normal faults parallel to the axial plane of the American Creek anticline.