Geology: Airdrie glacial erratic, near Calgary

The Airdrie erratic is one of three sections of the Foothills Erratics Train that have been designated as Provincial Historic Sites under the Historical Resources Act. Dr A. M. Stalker, a geologist with the Geological Survey of Canada, is standing in front of the erratic. Dr Stalker mapped the location of most of the Foothills Erratics Train across Alberta. The Airdrie erratic was carried and deposited by the same glacier that deposited the more famous "Big Rock" or Okotoks erratic.