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| | hrgeo.txt |
 | | Breccia pipe structures Some bowl-shaped depressions in the Kaibab Formation, characterized by inward-dipping strata, may be the surface expression of a breccia pipe, which developed by dissolution of the deeply buried Mississippian Redwall Limestone (Wenrich and Huntoon, 1989; Wenrich and Sutphin, 1989). |
 | | The softer Triassic and Jurassic strata present in the Vermilion Cliffs north of the map area are remnants of the deposits that once covered the Kaibab Plateau, and have eroded away and down-dip towards House Rock Valley. |
 | | The Paleozoic and Mesozoic rocks are sedimentary and are, in order of decreasing age, the Hermit Formation, Coconino Sandstone, Toroweap Formation, Kaibab Formation (Permian), and the Moenkopi Formation and Chinle Formation (Triassic). |
| geopubs.wr.usgs.gov /map-mf/mf2364/hrgeo.txt (6235 words) |
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