This map is one of a series of linear-features maps compiled for the U.S. Geological Survey's Northern Great Plains Regional Aquifer System Analysis (U.S. Geological Survey, 1979). This map shows the linear features that were recognized in Wyoming. Other maps in the series cover South Dakota (Cooley, 1983a), Montana (Cooley, 1983b), and North Dakota (Cooley, 1983c).