Hematite concretions eroded from the Navajo Sandstone.
https://geology.utah.gov/wp-content/uploads/7-21-15.jpg600800Utah Geological Surveyhttps://geology.utah.gov/wp-content/uploads/ugs-logo-large.pngUtah Geological Survey2015-07-21 16:56:492016-08-10 16:36:14POTD July 21, 2015: Grand Staircase–Escalante National Monument, Garfield County, Utah