Mud crack exposed on a slab of mudstone from the metamorphosed Shinimo Quartzite, Grand Canyon, Arizona. These 1,100 million year old mudcracks were found below Upper Ribbon Falls off the North Kaibab Trail. (Photo by Brian F. Gootee)
Photographer: Brian Gootee
Photo Date: circa 2013
Photo Location Accuracy: Approximately Located
Photo Tags: Ribbon Falls, North Kaibab Trail, Mesoproterozoic, sedimentary structure, mudcrack, Shinimo Quartzite