File:Grand Canyon Supergroup, Stromatolites in Bass Limestone 0019 - Flickr - Grand Canyon NPS.jpg
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![File:Grand Canyon Supergroup, Stromatolites in Bass Limestone 0019 - Flickr - Grand Canyon NPS.jpg](http://upload.wikimedia.org/wikipedia/commons/thumb/0/09/Grand_Canyon_Supergroup%2C_Stromatolites_in_Bass_Limestone_0019_-_Flickr_-_Grand_Canyon_NPS.jpg/800px-Grand_Canyon_Supergroup%2C_Stromatolites_in_Bass_Limestone_0019_-_Flickr_-_Grand_Canyon_NPS.jpg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 23:28, 17 February 2014 | ![]() | 3,008 × 2,000 (1.03 MB) | Matanya | == {{int:filedesc}} == {{Information |Description=NPS Photo by: Carl Bowman Bass Limestone: Thickness: 260-300 feet A number of different sedimentary rock types (such as conglomerate, dolomite and shale) occur within this light grey to brown formatio... |
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