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North Alabama rural highway. staring across the road at the sweet sweet curve of a 320 million year old reef. A couple of meters high in the middle and something like 50 m across. Corals built this city, along with bryozoans and crinoids. The coral, Lublinophyllum flaccidum, so named because it is by far the largest of its genus. Paleontologists, working sexual innuendo into science.