In late April I took nine enthusiastic Venturers to the Grand Staircase-Escalante National Monument in southern Utah. The area is astounding and contains colorful and interesting rock formations, many Native sites, a few streams and waterfalls, and more scenery than one can possible assimilate in one week.
cross-bedding in the Navajo Sandstone. We observed textures related to sand avalanches (when the ancient dunes became over-steepened and sloughed down the leeward side) and climbing translatent strata (textures left by wind ripples across the leeward side of the dune). Additionally, we saw these iron concretions in the sandstone where extra iron precipitated out from fluids to make spheres of hardened sandstone. When dislodged from the cliff, they become "Moki marbles."
flat-irons against the underlying Navajo Sandstone.