“The sediment deposition gets really complex,” David M. Lovelace, a geoscientist at the University of Wisconsin-Madison, who led a comprehensive study of the cave’s stratigraphy, explains. “Sediment that’s washing in can leave little pockets of deposition in one area. Then the inlet or the stream will shift slightly, so it deposits in another area.” Sometimes a fresh stream cuts through older sediment to drop in new surface material. “It literally forms almost a new cave through the old sediment, so you can deposit younger material under older, previously existing material. The complexities become outstanding.”
Office of Strategic Communication