I went to college upstate, in Geneva, NY. There was a canyon nearby where we used to go camping....the bottom was all shale, and every, I mean every, rock was packed with fossils...I believe from the Devonian..mostly crinoids, brachiopods, and corals. The corals had the exact same shape as a Cynarina skeleton, only smaller. Trilobites were rare...I only found one. I still have a scar on my finger from smashing rocks.