| Hermit Formation | |
|---|---|
| Stratigraphic range: Permian, Early Leonardian[1] | |
.jpg) (Isis Temple, central Grand Canyon) The 3 top geologic units visible: 3)-(white-cliffs-prominence)-Coconino Sandstone, 2)-(slope-forming-Deep brnsh-red)-Hermit Formation, 1)-(red-uppermost-vertical-cliff & resistant)-Esplanade Sandstone (top unit of 4–member Supai Group) (Note: Distinctive Redwall Limestone upper horizontal-platform.) | |
| Type | Geological formation |
| Underlies | Coconino Sandstone |
| Overlies | Supai Group |
| Thickness | 900 feet (270 m), at maximum |
| Lithology | |
| Primary | sandstone and mudstone |
| Other | siltstone and intraformational conglomerate |
| Location | |
| Region |  Arizona-(North & Central Arizona)  California-(southeast) and  Utah-(southern) |
| Country |  United States-(Southwestern United States) |
| Type section | |
| Named for | Hermit basin, Coconino County, Arizona[2] |
| Named by | Noble (1923)[2][3] |
The Permian Hermit Formation, also known as the Hermit Shale, is a nonresistant unit that is composed of slope-forming reddish brown siltstone, mudstone, and very fine-grained sandstone. Within the Grand Canyon region, the upper part of the Hermit Formation contains red and white, massive, calcareous sandstone and siltstone beds that exhibit low-angle cross-bedding. Beds of dark red crumbly siltstone fill shallow paleochannels that are quite common in this formation. The siltstone beds often contain poorly preserved plant fossils. It outcrops across northwestern Arizona from the Sedona area, and it outcrops in the Grand Canyon and the western Mogollon Rim, into the Aubrey Cliffs. It forms steep slopes that are typically mostly covered by debris and colluvium derived from the overlying sedimentary strata.[1]
- ^ a b Blakey, R.C., 2003. Supai Group and Hermit Formation in: Beus, S.S., Morales, M., eds., pp. 136–162, Grand Canyon Geology, 2nd. Oxford University Press, New York. 448 pp. ISBN 978-0-195-12298-5
- ^ a b Noble, L.F., 1923. A section of the Paleozoic formations of the Grand Canyon at the Bass Trail. U.S. Geological Survey Bulletin. 131-B, pp. B23-B73. doi:10.3133/PP131B. ISSN 0096-0446.
- ^ Cite error: The named reference
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