The objectives of US Geological Survey (USGS) work are to conduct geologic research characterizing tight gas-bearing sequences in the western United States. The USGS research during the last few years has been in the Greater Green River, Piceance Creek, and Uinta Basins of Wyoming, Colorado, and Utah. Additional critical objectives are to provide geologic research support for ongoing Multiwell Experiment engineering, petrophysical, log-analysis, and well-testing research. During FY-85, 33 papers, maps, and abstracts were published that included a wide range of topics. Of particular interest are two USGS Open-File Reports of geological studies conducted at the DOE Multiwell Experiment Site (MWX), Piceance Creek Basin, Colorado (Spencer and Keighin, 1984), and the Pinedale anticline, Green River Basin, Wyoming (Law, 1984). Because similar kinds of work were conducted in these two areas, the results offer the opportunity to evaluate the applicability of processes important in gas generation and accumulation. Excerpts of the studies covering stratigraphy, petrology, mineralogy, geophysics, rock mechanics, borehole geophysical-log interpretation, and well-data diagnostics are included in this report. The specific studies are authored by several USGS scientists and are cited in the references. The report is in four parts: (1) multiwell experiment studies; (2) Pinedale anticline studies; (3) other Piceance-Uinta Basin results; and (4) other Greater Green River Basin results. 69 figs., 8 tabs.