Doesn’t this look like ribs? Or shark gills? No, I’m pretty sure it isn’t a petrified shark! But still, I wonder how these patterns could have come about?
It also bears a resemblance to the cave formations know as bacon, or drapery, but they require an active source of water dripping down among the limestone in a cave.
Found this on the Fanning Trail of the Blevins Gap Nature Preserve in Huntsville, where there are several of such rocks near the Bailey Cove Branch creek.