Epes, located in Sumter County, sits atop Cretaceous chalk deposits from the formation known as the Selma Group. These mineral deposits are clearly visible along the shore of the Tombigbee River, which forms the eastern border of the city.

Epes, located in Sumter County, sits atop Cretaceous chalk deposits from the formation known as the Selma Group. These mineral deposits are clearly visible along the shore of the Tombigbee River, which forms the eastern border of the city.