About 500 million years ago, a sea worm ate dinner and left behind the mother lode of turds. Then, the worm left its burrow on the seafloor, and some shelled critters discovered the droppings and died — fossilized for eternity around the poopy picnic.
At first glance, it looks like a fiery monster out of "The Incredibles" movie. Or maybe a giant, irritated zit popping up above the Earth's surface. But it's neither. Rather, it's an incredibly rare, 65-foot-tall (20 meters) lava-dome fountain.