A gypsum occurrence, shown on Geological Survey of Canada Map 876A, is plotted next to a north-flowing tributary of Moosmoos River. The area has recently been mapped as rocks of the Upper Triassic Inzana Lake Formation, Takla Group (Open File 1992-4). The formation consists of volcanic sandstone, siltstone, cherty tuff, mudstone, argillite, lapilli tuff and augite porphyry tuff. No further information is available on the Moosmoos showing.