Joseph Burr Tyrell (1858-1957), 1893, 8 June, Grand Rapids Sandstone, underlain by Clearwater shale [on the Athabasca River], [1893 expedition to the barren lands [Geological Survey]], Black and white print, University of Toronto, Thomas Fisher Rare Book Library, LL/41413
Joseph Burr Tyrell (1858-1957) 1893, 8 June Grand Rapids Sandstone, underlain by Clearwater shale [on the Athabasca River] [1893 expedition to the barren lands [Geological Survey]]