Upper member of the Huntington Formation (Olds Ferry terrane) at a locality. Corals at the site include a high-growing, dendroid-phaceloid
species that acted as either framework or sediment baffles, and a lowgrowing, cerioid, encrusting coral and a sponge that acted as sediment herein named Willow Spring. binders. Together, these organisms produced at least a 10–50 cm high reef-like or reefal framework. Framework mineralogy of sandstones and clast types in the
conglomerate suggest that the source of these Triassic coral-sponge reef faunas was intrabasinal. The occurrence of the same two coral taxa in the Wallowa and Olds Ferry terranes may support the proximity of these two regions in the late Triassic, but the presence of these taxa in other Cordilleran terranes suggests that they are probably cosmopolitan and therefore not good indicators of terrane proximity.