Rocks and Railroads! Crystals and Caboose! Fossils and Freight! In this exclusive Breckenridge Heritage Alliance summer series, join local historian Sandra F. Mather, PhD., to hear about the millions of years it took to create the geology at Boreas Pass and around Rocky Point. The influence of geology on the railroad and the influence of the railroad on Breckenridge. Photo courtesy of the Sandra F. Mather Archives and Breckenridge Heritage Alliance, From Summit Historical Society.