The Great Mound is approximately 300 feet (91 m) across and consists of an outer embankment 9 feet (2.7 m) high and 63 feet (19 m) wide, surrounding a 60 feet (18 m) wide ditch that is 10.5 feet (3.2 m) deep.
The central platform, 138 feet (42 m) is diameter with a central mound, 4 feet (1.2 m) high and 30 metres (98 ft) in diameter.
The central mound was excavated in 1968/69 and found to have three clay layers, each with ashes, showing a succession of use periods.

The complex has been dated to 160 BCE through 50 CE These dates are obtained through radiocarbon dating and some artifacts.
A nearby log tomb was found with a platform pipe typical of Hopewell styles from 50 C.E. Post hole remnants were dated to 60 BCE and 230 CE.
 Radiocarbon dates from excavated material of the Great Mound established 160 BCE +/- 90 for the embankment.
The neighboring ‘’Fiddleback" Mound was dated to 120 BCE +/- 70.
The Great Mound is approximately 300 feet (91 m) across and consists of an outer embankment 9 feet (2.7 m) high and 63 feet (19 m) wide, surrounding a 60 feet (18 m) wide ditch that is 10.5 feet (3.2 m) deep. The central platform, 138 feet (42 m) is diameter with a central mound, 4 feet (1.2 m) high and 30 metres (98 ft) in diameter. The central mound was excavated in 1968/69 and found to have three clay layers, each with ashes, showing a succession of use periods.
The complex has been dated to 160 BCE through 50 CE These dates are obtained through radiocarbon dating and some artifacts. A nearby log tomb was found with a platform pipe typical of Hopewell styles from 50 C.E. Post hole remnants were dated to 60 BCE and 230 CE.  Radiocarbon dates from excavated material of the Great Mound established 160 BCE +/- 90 for the embankment. The neighboring ‘’Fiddleback" Mound was dated to 120 BCE +/- 70.
Mounds State Park