Originally Seip Earthworks enclosed 121 acres with 10,000 feet of embankment walls that rose up to 10 feet high. These earthen walls, some with regularly spaced openings, formed a connected square, circle, and semicircular shape. Enclosed within these walls were several mounds including the largest, Seip I mound, measuring 240 feet long, 160 feet wide, and 30 feet tall. Within the enclosure are three smaller conjoined mounds and several small individual mounds. Excavations of the site have revealed post holes, evidence of wooden shelters. Outside the embankment walls were additional mounds. Much of the extensive earthworks site has been negatively impacted by cultivation practices but the entire complex remains visible from the air.
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