Numerous oil seeps and oil sands have been reported in the literature in Wyoming. Clark and Glass (Clark, M., and Glass, G.B., 1982, Review of reported tar sand occurrences and recent projects in Wyoming: Geological Survey of Wyoming Open File Report 82-5, 49 p.) reviewed the literature for reports of occurrences and catalogued 78 reported occurrences of shallow or outcropping oil sands and oil seeps in Wyoming. The majority of these references are quite old, with vague descriptions of locations and formations containing the oil. The purpose of this study was to do a reconnaissance field examination of selected occurrences to better describe the occurrence and make some assessment as to the potential economic importance of the deposit. A reconnaissance geologic map of the occurrence was constructed from field observations and existing maps from the literature. The deposit was sampled, described and photographed. Since it was impossible to visit 78 reported occurrences, the author visited only those surface occurrences which appeared significant based on the descriptions in the literature. A total of ten occurrences were visited and described during the summers of 1984 and 1985. The author attempted to locate additional reported occurrences, but either the description in the literature was too vague to locate the deposit or evidence of the occurrence could no longer be located due to developmental activity in the area. Also, a few of the occurrences which were located were deemed to be insignificant and were not described in detail or sampled. The oil sand occurrences examined were all in sandstones of varying depositional environments and ranged in age from Tertiary to Pennsylvanian. Examples of both structural and stratigraphic traps were examined. Both oil seeps examined appeared to be related to nearby faults. Some of the occurrences contain live oil at the outcrop while others appeared to contain primarily dead oil. 39 refs., 32 figs.