Located in Douglas County southeast of Chatfield State Park, the Lamb Spring Archaeological Site is the only major site with Paleo-Indian (before 6000 BCE) deposits in the metropolitan Denver area. First excavated in 1961–62, the site contains bison and…

The Wilbur Thomas Shelter Archaeological Site is a rockshelter in northwest Weld County featuring evidence of at least six intermittent occupations stretching over 8,500 years. David A. Breternitz and graduate students from the University of Colorado…