Figure 25
From: RETRACTED ARTICLE: The Hopewell airburst event, 1699–1567 years ago (252–383 CE)
Comet-shaped Milford earthwork based on E. G. Squier and E. H. Davis’ 1848 Ancient Monuments of the Mississippi Valley Comprising the Results of Extensive Original Surveys and Explorations (Smithsonian Institution, Washington D.C.). Kenneth Barnett Tankersley used Microsoft PowerPoint for Mac Version 16.41 (www.microsoft.com) to create this figure.
