Extended, but still very incomplete, exploration of the Uinta basin has resulted in discovery of numerous gas fields for which outlets gradually are becoming available. However, disappointing performance of some (mainly Wasatch Formation) fields after pipeline connection recently has reduced interest in exploration. Three Tertiary formations, one Cretaceous group, and one Jurassic formation are capable of production in the basin; seven other formations of Cretaceous to Pennsylvanian ages produce nearby and, therefore, have an indicated gas potential in the Uinta basin. A long history of oscillating marine transgressions coupled with several tectonic episodes has produced many good reservoir rocks as well as potential source rocks in this area. Most of the gas accumulation discovered are in lenticular sandstone of Late Cretaceous and Tertiary ages. It is notable that the Tertiary strata are of lacustrine and fluviatile origin and the gas traps are almost entirely stratigraphic.