Mystery holes form at Indiana Dunes
Officials have shut down a popular public sand dune in Indiana where mysterious holes are appearing—one of which swallowed up a boy for three hours last summer, the Times of Northwest Indiana reports. Two more holes have opened up since then and other depressions have been sighted, prompting the shut-down of Mount Baldy at Indiana Dunes National Lakeshore. But no one knows why it’s happening; the holes, which measure about a foot in diameter, exist for no more than 24 hours, at which point they collapse and are refilled with neighboring sand. “We’re seeing what appears to be a new geological phenomenon,” geologist Erin Argyilan tells the Chicago Tribune. She has mapped the terrain, studied sediment, and looked at wind patterns for the past 10 months, but still, no luck. More