The Schnebly Hill Formation is a

section Section, Sectioning, or Sectioned may refer to: Arts, entertainment and media * Section (music), a complete, but not independent, musical idea * Section (typography), a subdivision, especially of a chapter, in books and documents ** Section sig ...

of red bed deposits found at the

Colorado Plateau The Colorado Plateau is a physiographic and desert region of the Intermontane Plateaus, roughly centered on the Four Corners region of the Southwestern United States. This plateau covers an area of 336,700 km2 (130,000 mi2) within w ...

, near

Sedona, Arizona Sedona ( ) is a city that straddles the county line between Coconino County, Arizona, Coconino and Yavapai County, Arizona, Yavapai counties in the northern Verde Valley region of the U.S. state of Arizona. As of the 2010 United States Census, ...

. It is a dark red

sandstone Sandstone is a Clastic rock#Sedimentary clastic rocks, clastic sedimentary rock composed mainly of grain size, sand-sized (0.0625 to 2 mm) silicate mineral, silicate grains, Cementation (geology), cemented together by another mineral. Sand ...

, from to thick. It lies between

Coconino Sandstone The Coconino Sandstone is a geologic formation (geology), formation composed of light-colored quartz arenite of Aeolian processes, eolian origin. It erodes to form conspicuous, sheer cliffs in the upper walls of Grand Canyon, as part of the Mog ...

and the older

Hermit Formation 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 Her ...

. It is near the

Supai Group The Supai Group is a slope-forming sequence of mixed red beds and limestones that outcrop in the Colorado Plateau. The group was laid down during the Pennsylvanian to Lower Permian. Cliff-forming interbeds of sandstone are noticeable througho ...

. The source of the name "Schnebly" is Sedona Schnebly, after whom the city of

, was named.

Geology

The formation traces to the Permian Age. The formation is the most prominent layer of the

red rocks Red Rocks Amphitheatre (also known colloquially as simply Red Rocks) is an open-air amphitheater in the western United States near Morrison, Colorado, approximately southwest of Denver. It is owned and operated by the city of Denver. In addi ...

of the Sedona area due the presence of

hematite Hematite (), also spelled as haematite, is a common iron oxide compound with the formula, Fe2O3 and is widely found in rocks and soils. Hematite crystals belong to the rhombohedral lattice system which is designated the alpha polymorph of . ...

– iron-oxide (rust) – giving the

a red color. The Schnebly Hill Sandstone formation comprises three sections: * the Bell Rock member, * the Fort Apache member, and * the Sycamore Pass member.

References

External links and references

Schnebly Hill Formation, a few images

A hiking site on the Schnebly Hill Formation

Travels in goeology, Sedona area

Relationship between Schnebly Hill Formation and the Supai Group

On YouTube video
Sedona, Arizona Mogollon Rim Colorado Plateau Landforms of Coconino County, Arizona Landforms of Yavapai County, Arizona {{geologic-formation-stub

Geology

See also

Sedona-area rocks

Local geology

Local interest

References

External links and references