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| This zoomed-in view is looking east from the South Kaibab Trail toward the Tonto Platform (in the foreground) and Inner Gorge. On the opposite side of the Inner Gorge, the Precambrian-age Bass Formation forms a flat-lying ledge above the Greatest Angular Unconformity exposed along the top of the Precambrian-age crystalline Vishnu basement Rocks (mostly granite and schist) that make up the Inner Gorge. The Great Unconformity is above the above the cliff-forming Bass Formation and below the softer, slope- and bench-forming sediments of the Cambrian-age sediments of the Tonto Group (Tapeats Sandstone and Bright Angel Shale) (Billingsley, 2000; Billingsley and others 1997). However, the differences between the two unconformities ("Greatest" and "Great") is easy to see elsewhere in the Phantom Ranch area. |
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