The Mann site is a Crab Orchard culture site located off Indian Mound Road in Mount Vernon, Posey County, Indiana. It was placed on the National Historic Register on October 1, 1974. Exotic ceramics and other artifacts found at the site reflect contact with Ohio Hopewell people, in addition to more distant peoples in the Southeast of the Swift Creek c…The Mann site is a Crab Orchard culture site located off Indian Mound Road in Mount Vernon, Posey County, Indiana. It was placed on the National Historic Register on October 1, 1974. Exotic ceramics and other artifacts found at the site reflect contact with Ohio Hopewell people, in addition to more distant peoples in the Southeast of the Swift Creek culture of the Georgia Piedmont and Gulf Coastal Plain.