https://geology.utah.gov/wp-content/uploads/ugs-logo-large.png00Utah Geological Surveyhttps://geology.utah.gov/wp-content/uploads/ugs-logo-large.pngUtah Geological Survey2014-04-28 12:43:292016-08-10 16:39:45Seeking long-lived mammals, paleontologist finds two that lasted at least 23 million year