The Gray Site is a Miocene-epoch assemblage of fossils located near the unincorporated town of Gray, Tennessee in Washington County, and dates from 7 to 4.5 million years ago. The Gray Fossil Site was discovered by geologists in May 2000. They were investigating unusual clay deposits turned up during the course of a Tennessee Department of Transportation highway project to widen State Route 75 south of its intersection with Interstate 26.