Elena McKinnon looks at trees pointed out to her by friend, Todd Reuter, at Devil's Millhopper Geological State Park Sunday. Curtis Baldwin and his son, Scott, 15, descend the 236 steps into the sinkhole at left. The 120-feet-deep cavern was created after an underground cavern collapsed an estimated 10,000-14,000 years ago. Now, many waterfalls end in the hole and help to feed the lush plant growth and animal life throughout the sink hole. Fossils such as shark teeth and extinct animal bones have been found at Devil's Millhopper which is open from 9-5 Wednesday through Sunday.