MAKE A MEME View Large Image Grand Canyon Supergroup with basalt dike in Hakatai Shale.JPG See file name http //www nature nps gov/geology/parks/grca/age/index cfm National Park Service PD-USGov Grand Canyon Grand Canyon basement rock geology Unkar Group Hakatai Shale ...
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Keywords: Grand Canyon Supergroup with basalt dike in Hakatai Shale.JPG See file name http //www nature nps gov/geology/parks/grca/age/index cfm National Park Service PD-USGov Grand Canyon Grand Canyon basement rock geology Unkar Group Hakatai Shale Geology of Arizona
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