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Overview of this Site
The Gateway Fan is a Pennsylvanian to Permian age alluvial fan that was shed off of the west side of the Uncompahgre uplift. The sediments in the fan become obviously finer grained as one travels away from the western edge of the uplift.
To get to the Gateway Fan travel west on Highway 141 through Unaweep Canyon. As soon as you exit the portion of the canyon that cuts through igneous rocks make a left (head south) on the first dirt road that crosses the creek. Head up the canyon until you see rocks like the ones shown here. You will then be in the fan.