We passed this southern Utah formation on our way to western Colorado. Photo by Verna. Click to enlarge.
The Mexican Hat Rock Formation is a unique geological formation located in southeastern Utah, USA. It is a remnant of a sandstone layer of the Halgaito Formation, formed from sediments deposited on a coastal plain next to a shallow seaway during Late Pennsylvanian time. The formation is a balanced rock, with a broad, flat, orange-red sandstone cap standing on a narrow pedestal of shale and siltstone, resembling an upside-down sombrero. This unique shape is due to different rates of erosion and weathering, where the softer layers of shale and siltstone were eroded faster from underneath the more resistant cap of sandstone.