surrounding areas were also affected by deformation and erosion during the Cenozoic Era. Many sedimentary rocks from the Paleozoic and Mesozoic eras exist in the basins surrounding the pass. History Rollins Pass as a prehistoric Paleoindian & Native American hunting complex Paleoindians and early Native Americans were the first to utilize Rollins Pass as a natural, low crossing over the Continental Divide for the purposes of communal hunting of large game, including bighorn sheep and elk. There are more than 96 documented game drives, including the Olson game drive, found largely above timberline and near the summits of multiple mountain ridges. Handmade rock walls drove prey toward hunters waiting in blinds. These unique high-altitude constructs were built, refined, and continually used over millennia. The game drives built on—and over—Rollins Pass have international significance. The Olson game drive The Olson site (5BL147) is a multi-component rock walled game drive and is but one part of a much larger game drive complex located on Rollins Pass. Byron Olson and James Benedict conducted work at the site in the late-1960s. Present-day archaeology teams built on Olson and Benedict's work to expand the overview of the site using modern techniques. As of 2013, at least 45 blinds as well as 1,307 meters of rock walls are present across the Olson site; the purposes of which were to funnel game upslope to waiting hunters. Both radiocarbon and lichenometric dating suggest occupation by Native Americans spanning the last 3,200 years, with diagnostic tools suggesting even older use of the site, dating back to more than 10,000 years ago. Other significant game drives Game drives at other locations on Rollins Pass yield hundreds of additional blinds and miles of rock walls. Rollins Pass as a late-prehistoric and historic Native American route Rollins Pass has a documented history as a migratory route, hunting trail, and battlefield among the late prehistoric and contact-period Indians of Colorado. Rollins Pass as an historic wagon road The first recorded use of the pass (then known as Boulder Pass or Rollinsville Pass) by a wagon train was in 1862, nearly 14 years before Colorado became a state. Directions for wagons traveling from Rollinsville to Winter Park were published in newspapers. John Quincy Adams Rollins, a Colorado pioneer from a family of pioneers, constructed a toll wagon road over the pass in the 1873, providing a route between the Colorado Front Range and Middle