Yeah, this ones hard to type. Kirks are very common in Illinois and the serrations are a key marker type. One side has the serrations worn away which implies a knife. Were woodland era points used as knives? I’m almost thinking Kirk as these are the most common in Illinois-but heavily reworked..?
I used to have a multi-component site just outside of southern Illinois where I found several similar points. I can’t even articulate why, but I believe them to be a late-Woodland point. The serrations are atypical for the period but hey, that’s my thought. Nice find.