I finished elementary school in northern Indiana. We accidentally found some crinoid fossils in the gravel of the playground. We went and asked our teacher wha

I finished elementary school in northern Indiana. We accidentally found some crinoid fossils in the gravel of the playground. We went and asked our teacher what they were and, surprisingly, she knew. After that we spent all our time sifting through the gravel for more fossils. That was more than 40 years ago and I still have my old school pencil box full of crinoid fossils.