Extremely Rare Rock Dating Back to Ice Age Discovered in Oregon On 5/19/21 at 5:11 PM EDT While overseeing the construction of a new middle school in Lake Oswego, Oregon, Skanska USA Building superintendent Jacob Parker noticed that one of the rocks his crew had dredged up was not your average hunk of stone, according to the Tualatin Historical Society. In fact, he'd never seen anything like it before. This massive chunk of rhyolite was recently discovered by construction workers in Oregon. It is an extremely rare find. YouTube/Tualatin Historical Society Struck by its distinctiveness of color and texture, Parker contacted Scott Burns, a professor of geology at Portland State University and the president of the Tualatin Ice Age Foundation, according to a Skanska press release. Founded in 2018, the organization works to educate residents of the eponymous city about the impact of the Ice Age on the local landscape.