Situated as it is smack-dab in the middle of Indiana's stone belt, Indiana University is naturally a limestone-rich campus. Today on a short walk, I snapped several photos of fossils sitting right out in the daylight, in the stones comprising walls along our lovely arboretum. They're probably unnoticed by the vast majority of passersby with their eyeballs glued to the little glowing screens in their hands. Though I must concede that these photos are thanks to my recent upgrading to a new phone: I now have a great camera on me at all times.
This is all Mississippian limestone, therefore composed mostly of fragments of corals, crinoids, blastoids, and brachiopods. Glorious.