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| Keywords: fossils geology paleontology petrified wood tracks trackway national park service nationalparkservice outdoor texture landscape rock rock formation Fossil trilobite feeding traces (Cruziana) in the Bright Angel Shale, Grand Canyon National Park, Arizona. (NPS Photo by Cassi Knight, Paleontology Guest Scientist) Fossil trilobite feeding traces (Cruziana) in the Bright Angel Shale, Grand Canyon National Park, Arizona. (NPS Photo by Cassi Knight, Paleontology Guest Scientist) | ||||
