Natural Fort
Wyoming sits on an escarpment known as the Gangplank. This escarpment rises to the west toward the Rockies. As you head south out of Wyoming into Colorado, you descend into the Colorado Piedmont. This separates the mountains from the High Plains. This area is mostly sandstone. Just a few miles on I-25 south in Colorado you will notice sandstone outcrops on either side of the road, commonly referred to as Natural Fort. This interesting piece of landscape is at the base of the Oligocene White River Formation. These photos show how soft and easily erodible the sandstone is. There used to a rest area at Natural Fort but it is no longer there. The easiest way to get there is to take Terry Ranch Road out to the site.
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