Wikipedia contributors. (2024, February 19). 2018. In Wikipedia, The Free Encyclopedia. Retrieved February 24, 2024, from https://en.wikipedia.org/w/index.php?title=2018&oldid=1208851275
https://github.com/davepinch/pinchy.cc/blob/master/content/topics/years/2018/en.wikipedia.org.snippet-december-15.md
The presence of older glacial deposits within the St. Croix River basin proves that the Laurentide Ice Sheet has repeatedly glaciated this region during the Pleistocene Epoch.