This map, from the Paleontology Portal, shows the areas of Missouri whose surface fossils are from the Carboniferous Period. The darker blue is for the early Carboniferous (Mississippian) and the lighter blue is for the later Carboniferous (Pennsylvanian.) |
I wondered if I may have found a different species of Michelinia. A quick consultation with Internet colleagues has me fairly convinced that it is a species of Michelinia, perhaps favosa. Checking some fossil guides at the library seems to confirm this, mainly based on the honeycomb structure and the Carboniferous age of St. Louis's soil. Until someone more knowledgeable can tell me otherwise, that's what I'll believe.
I'm fascinated by the idea that this area was once a shallow sea, home to early fish. I was about 5 or 6 years old the first time I heard that Missouri was once underwater. I think I was spooked by that thought at the time. Later, I found the St. Louis Science Center's life-size display of just such a shallow sea from the Paleozoic. My high school was right next to the Science Center, and occasionally after school I'd wander around the museum. The shallow sea display meets you when you turn a corner in the natural history exhibit. You find yourself at eye level with strange tubular early sharks, ammonites, and trilobites. The lighting is dimmed, and the display casts a deep blue haze. Sometimes I'd imagine as I looked at the display that the indigo haze swept across the whole of the state and that St. Louis was still covered by the prehistoric sea. The fact that this coral I found probably once grew from a coastal reef and that breaking waves could once be heard in South County is endlessly thought-provoking for me.