<Tr> <Td> Adena Mound </Td> <Td> </Td> <Td> The Adena Mound, the type site for the culture, is a registered historic structure near Chillicothe, Ohio . </Td> </Tr> <Tr> <Td> Biggs Site </Td> <Td> </Td> <Td> The site, located in Greenup County, Kentucky, is a conical abide surrounded by a series of circular ditches and embankments . It is connected to the Portsmouth Earthworks directly across the Ohio River in Portsmouth, Ohio . </Td> </Tr> <Tr> <Td> Criel Mound </Td> <Td> </Td> <Td> A 35 - foot (11 m) high and 175 - foot (53 m) - diameter conical mound, it is the second largest of its type in West Virginia . It is located in South Charleston, West Virginia . P.W. Norris of the Smithsonian Institution oversaw the excavation . His team discovered numerous skeletons along with weapons and jewelry . </Td> </Tr> <Tr> <Td> Enon Mound </Td> <Td> </Td> <Td> Ohio's second largest conical burial mound, it is believed to have been built by the Adena . </Td> </Tr>

What were the achievements of the adena hopewell and mississippian