Dr. Holen is the principal investigator for a cooperative agreement between the U.S. Bureau of Reclamation and Denver Museum of Nature & Science. He assists the Bureau in investigations of Paleo-Indian sites found eroding from several of their reservoirs in the central Great Plains.
Recent work has centered on salvaging several archaeological and paleontological mammoth sites dating between 16,000 and 20,000 years old. Three of these sites—La Sena, Lovewell and Hamburger—contain fractured mammoth bones indicating humans fractured and flaked mammoth limb bone for the production of bone tools.
