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The Sixtymile Formation is a very thin accumulation of sandstone, siltstone, and breccia underlying the Tapeats Sandstone that is exposed in only four places in the Chuar Valley. These exposures occur atop Nankoweap Butte and within Awatubi and Sixtymile Canyons in the eastern Grand Canyon, Arizona. The maximum preserved thickness of the Sixtymile…
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sixtymile formation chuar member syncline sandstone group canyon upper grand middle within ft tapeats beds butte nankoweap lower underlying fault
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Sixtymile Formation | Country | United States | 1.00 | infobox |
| Sixtymile Formation | Extent | the Chuar syncline, Grand Canyon | 1.00 | infobox |
| Sixtymile Formation | Named by | Ford et al. (1972), Ford and Breed (1973), and Elston (1979) | 1.00 | infobox |
| Sixtymile Formation | Other | intraformational breccia | 1.00 | infobox |
| Sixtymile Formation | Overlies | Chuar Group | 1.00 | infobox |
| Sixtymile Formation | Primary | siltstone and sandstone | 1.00 | infobox |
| Sixtymile Formation | Region | Northern Arizona | 1.00 | infobox |
| Sixtymile Formation | Thickness | 60 m (200 ft), at maximum | 1.00 | infobox |
| Sixtymile Formation | Type | Geological formation | 1.00 | infobox |
| Sixtymile Formation | Underlies | Tapeats Sandstone | 1.00 | infobox |
| Sixtymile Formation | Unit of | Tonto Group | 1.00 | infobox |
| Sixtymile Formation | is a | very thin accumulation of sandstone | 0.90 | text |
| Sixtymile Formation | is a | disconformity that laterally becomes an angular unconformity | 0.90 | text |
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