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Keywords: fossils geology paleontology petrified wood tracks trackway national park service nationalparkservice outdoor texture photo border Fossil stromatolites in a block of Bass Limestone, in Grand Canyon National Park, Arizona. (NPS Photo by Cassi Knight, Paleontology Guest Scientist) Fossil stromatolites in a block of Bass Limestone, in Grand Canyon National Park, Arizona. (NPS Photo by Cassi Knight, Paleontology Guest Scientist) |