Do you know if someone collected the trilobites, or if naturally located?

They are a CLASSIC fossil! Never found one in the field anywhere.

I don't believe they occurred in KC (maybe the KC-Lansing is much too young). Are trilobites all Cambrian? I think the KC-Lans is Cretaceous or something like that, that's why that massive limestone there. Mom used to tell that there were underground speakeasies in old mines under the limestone layer...