I've recently been looking over the geologic formations in Illinois and I found one that's a bit interesting - it's a Cambrian period outcrop but it seems to be a bit small, only found in parts of Ogle and Lee County, Illinois.
http://ebeltz.net/firstfam/1stfam.html
https://www.osti.gov/servlets/purl/1202269
https://ilstratwiki.web.illinois.edu/index.php/Cambrian_System
I haven't heard of a lot of fossils coming from this area so I'm wondering if anyone's been fossil hunting in that region of Illinois before and how common are Cambrian Fossils from Illinois's Ogle and Lee Counties?