http://www.travelok.com/listings/view.profile/id.8525 - Among the top natural wonders of Oklahoma, the Wichita Mountains Wildlife Refuge features 600 million years of geology. In this video, Ron Stahl walks along the Dogrun Hollow National Recreation Trail with the manager of the wildlife refuge, Jeff Rupert, highlighting some of the awe-inspiring geological features that include prairie meadows, cross timbers forests, and small bodies of water.
