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My wife and I recently traveled to Brown County, Indiana (Nashville) so she could attend a friend's baby shower and, while she was there, I slipped away to check out some local streams for fossils. I remembered finding lots of geodes and crinoids around Lake Monroe (to the west) as a kid attending scout camp so I was hoping I might have similar luck on this trip. I lucked out and the stream I checked had many, MANY geodes and a smattering of crinoids and other fossil material. After doing some searching on this forum and elsewhere online, it seems these geodes are frequently formed around (within?) fossils as is the case for a couple of the crinoids in the photo below. The second image looks like it could be some kind of geodized coral? I was wondering if the third and fourth image is of a crinoid crown? Lastly, one of the big geodes I brought back is similar in shape to what I'd expect from a crinoid crown and has some ridges that almost look like faded crinoid parts. Are these just normal annulations found on all geodes or is this possibly a crinoid crown too (I assume it is too big)? I believe all the fossils in this area should be Mississippian (based on websites discussing the fossils around nearby Lake Monroe). Also, is it likely that most of the geodes in this area formed in association with some kind of underlying fossil? I had no idea about the association between geodes and fossils and am looking forward to learning more from anyone here who could enlighten me! Thanks, -Andrew