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Date: 2013-02-12 13:43:40Purgatoire River track site Comanche National Grassland Trace fossil Canyonlands National Park Triassic Jurassic Paleontology Fossil Geological unit Geology Utah Geography of the United States | Set in Stone Learning from Layers of GeologyAdd to Reading ListSource URL: www.fs.usda.govDownload Document from Source WebsiteFile Size: 1,29 MBShare Document on Facebook |