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Precambrian - Cambrian Unconformity in Grand Canyon.jpg - GeoWriter
Grand Canyon Supergroup, Stromatolites in Bass Limestone 0019 - Flickr - Grand Canyon NPS.jpg - Matanya
Grand Canyon Supergroup Stromatolites in Bass Limestone 0020 - Flickr - Grand Canyon NPS.jpg - Matanya
8323 Grand Canyon Fossil Stromatite in Bass Limestone (4749611340).jpg - Killarnee
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