Devil's Kitchen Sinkhole
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The Devil's Kitchen Sinkhole is a
sinkhole A sinkhole is a depression or hole in the ground caused by some form of collapse of the surface layer. The term is sometimes used to refer to doline, enclosed depressions that are also known as shakeholes, and to openings where surface water ...
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, ...
on the Soldier Pass Trail in the
Coconino National Forest The Coconino National Forest is a 1.856-million acre (751,000 ha) United States National Forest located in northern Arizona in the vicinity of Flagstaff, with elevations ranging from 2,600 feet to the highest point in Arizona at 12,633 feet (H ...
. Formed in the late 1880s, it is one of the at least seven sinkholes surrounding the city. The sinkhole is about deep but leads to a cave that adds , for a total of . Its interior contains vegetation.


Geology

The sinkhole was formed by
subsidence Subsidence is a general term for downward vertical movement of the Earth's surface, which can be caused by both natural processes and human activities. Subsidence involves little or no horizontal movement, which distinguishes it from slope mov ...
into caverns of paleokarst composed of
Redwall Limestone The Redwall Limestone is an erosion-resistant, Mississippian age, cliff-former, cliff-forming geological formation that forms prominent, red-stained cliffs in the Grand Canyon. these cliffs range in height from to . It is one of the most fossili ...
of the Pennsylvanian subperiod. After the second collapse, a large block was displaced. Many of the edges of the broken-off rocks were very angular. This was different on the south wall, however, as it had rounded rocks instead. In addition, many of the surfaces on the south wall also contained a
patina Patina ( or ) is a thin layer that variously forms on the surface of copper, brass, bronze, and similar metals and metal alloys ( tarnish produced by oxidation or other chemical processes), or certain stones and wooden furniture (sheen prod ...
of
manganese oxide Manganese oxide is any of a variety of manganese oxides and hydroxides.Wells A.F. (1984) ''Structural inorganic chemistry'' 5th edition Oxford Science Publications, . These include * Manganese(II) oxide, MnO * Manganese(II,III) oxide, Mn3O4 * Man ...
, inferring that the area was exposed over a few hundred years. Following collapses do not cause the sinkhole to become deeper, instead widening it. The walls on the upper area of the sinkhole are made out of
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 the
Schnebly Hill Formation The Schnebly Hill Formation is a section of red bed deposits found at the Colorado Plateau, near Sedona, Arizona. It is a dark red sandstone, from to thick. It lies between Coconino Sandstone and the older Hermit Formation. It is near the Supa ...
, while the lower areas are made from shaly
siltstone Siltstone, also known as aleurolite, is a clastic sedimentary rock that is composed mostly of silt. It is a form of mudrock with a low clay mineral content, which can be distinguished from shale by its lack of fissility. Although its permeabil ...
of the
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 ...
.


History

The initial collapse occurred in the early 1880s. The first person to view the new landform was Jim James. A second collapse happened in late 1989, opening the cave by around forty percent in the northern section.An interpretive sign near the sinkhole. An image can be foun
here
.
The
United States Forest Service The United States Forest Service (USFS) is an agency within the United States Department of Agriculture, U.S. Department of Agriculture. It administers the nation's 154 United States National Forest, national forests and 20 United States Natio ...
conducted a geologic study of the sinkhole in 1990 to prevent visitors from falling victim to a spontaneous sinkhole formation.


References

{{reflist Landforms of Yavapai County, Arizona Sinkholes of the United States