Houchens said only a small portion of the cave is open to visitors, a distance of less than a mile including the boat ride. He said the area available for public tours could be expanded in the future.
“I call this cave plus,” Houchens said. “There are some caves with great formations, some caves with great boat rides. But in our case we have a cave with great formations, waterfall, boat ride and we have the ice agebones.
“Because the natural entrance was closed during the ice age, all of the bones sat in a giant refrigerator for more than 12,000 years,” he said. Houchens said a bone that was carbon dated measured 38,000 to 42,000 years old, so researchers consider the bones 40,000 years old.
Above Ground Indiana Caverns has several activities including gemstone and fossil panning, walking trail and picnic area. Since it opened more than10,000 people have visited the caves.