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![]() Further on in the Precambrian shield story... |
![]() Thin layers in rocks, formed in sand carried by rivers, slope downstream (to left), and indicate the direction in which ancient rivers flowed. (Courtesy of Saskatchewan Industry and Resources) |
![]() Quartz, from which these white pebbles are formed, is the most abundant mineral in the sedimentary rocks of Athabasca Basin. (Courtesy of Saskatchewan Industry and Resources) |
![]() Life existed in these ancient shallow lakes in the form of cabbage-shaped, banded structures called stromatolites produced by photosynthetic bacteria. (Courtesy of Saskatchewan Industry and Resources) |
![]() Mudcracks preserved in rock show that the ancient rivers periodically dried up. (Courtesy of Saskatchewan Industry and Resources) |
![]() Open pit uranium mine. (Courtesy of Cameco Corporation) |
![]() Underground uranium mine. Clean energy: nuclear reactors produce no greenhouse gases, although depleted uranium fuel cells need to be stored safely. (Courtesy of Cameco Corporation) |
Did You Know ? |
2006-05-05 |