Long, A., and Martin, P.S., 1974, Death of American ground sloths: Science, v. 186, p. 638-640. Authors Long, A., and Martin, P.S. Publication Date 1974 Citation Science, v. 186, p. 638-640. State AZ Province TR County MO Placenames Grand Wash Cliffs Keywords Paleontology Vertebrate Cave Trace Fossil Geochronology More Keywords Paleontology, Vertebrate, Cave, Trace Fossil, Geochronology, AzGeoBib RefNum 6076