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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). However, the differences between the two unconformities ("Greatest" and "Great") is easy to see elsewhere in the Phantom Ranch area. |
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