Summer Island site - Credit: Wikimedia Commons
The Summer Island site, designated 20DE4, is an archaeological site located on the northwest side of Summer Island, in Delta County, Michigan. It is classified as a stratified, multi-component site with Middle Woodland (c. 100 B.Cā500 A.D.), Upper Mississippian (c. 1000ā1500 A. D.) and Early Historic/Protohistoric occupations (c. 1500ā1700). It was listed on the National Register of Historic Places in 1971. Read more on Wikipedia
Source: en.wikipedia.org