The Hannibal Rivertown Review Podcast - S1E11 (Did you know Missouri has a state crinoid ... and what the heck IS a crinoid?)

The oldest show cave in the state of Missouri is Mark Twain Cave, and the newest geological cave in the state is Cameron Cave, both in Hannibal. Linda Coleberd's family has owned both caves for nearly a hundred years. On this episode, Linda teaches us about stalactites, stalagmites and ... stalagpipes? And, what is a crinoid?