Jurassic armored mud balls – one of the rarest sedimentary rock structures on the planet! Prof. Richard Little explains how he discovered them, how they formed, and why they’re so rare. Featuring stories of plate tectonics, floods, changing climates, and suspension bridges! Sponsored by the Friends of the Great Falls Discovery Center. This presentation is preceded by a brief Friends Group annual meeting. Following, take a guided and short 10-minute walk to Unity Park and see the real armored mud balls! Light refreshments provided. Meet in the Great Hall.