This is one of several boulders unearthed during construction of the South Fifth Avenue Parking Garage in 2010. Though most were limestone boulders originating in northern Michigan, this gneissic boulder originated in Canada. All were glacially transported to this site in Ann Arbor during the last ice age 14,000 to 18,000 years ago. Glaciers are the only geological transport mode capable of collecting materials from different origins, mixing them together and depositing them elsewhere.

343 South Fifth Avenue, Ann Arbor, United States