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| Keywords: Geological time spiral - large.png en A diagram depicting geologic time periods 2008 The geologic time spiral ”A path to the past ver 1 1 U S Geological Survey General Information Product 58 poster 1 sheet Available online at http //pubs usgs gov/gip/2008/58/ Joseph Graham William Newman and John Stacy 2008 PD-USGov Uploaded with UploadWizard Faunal succession Spirals in art | ||||
