Needle Rock Natural Area

Needle Rock
Needle Rock Colorado
Highest point
Elevation	7,797 ft (2,377 m) ^[1]^[2]
Coordinates	38°43′28″N 107°33′00″W / 38.7244335°N 107.5500571°W / 38.7244335; -107.5500571Coordinates: 38°43′28″N 107°33′00″W / 38.7244335°N 107.5500571°W / 38.7244335; -107.5500571 ^[2]
Geography
Location	Delta County, Colorado, U.S.^[2]
Parent range	West Elk Mountains
Topo map	USGS 7.5' topographic map Crawford, Colorado^[2]
Geology
Age of rock	c.a. 28 Ma
Mountain type	Composite volcano
Climbing
Easiest route	rock

Needle Rock is an intrusive of rhyodacite volcanic plug^[3] located in the Needle Rock Natural Area, 3.5 miles (5.6 km) east-northeast (bearing 68°) of the Town of Crawford in Delta County, Colorado, United States. It stands 800 feet (240 m) tall above the floor of the Smith Fork of the Gunnison River valley. It originated as the throat of a large volcano about 28 million years ago in the Miocene geological epoch, when molten rock intruded between existing sedimentary rocks.^[4] The plug may represent the eroded conduit of a laccolith.^[3]

References

↑ The elevation of Needle Rock includes an adjustment of +1.473 m (+4.83 ft) from NGVD 29 to NAVD 88.
1 2 3 4 "Needle Rock". Geographic Names Information System. United States Geological Survey. Retrieved November 6, 2014.
1 2 "MINERAL RESOURCES OF THE WEST ELK WILDERNESS and vicinity, Delta and Gunnison Counties, Colorado: Open-file report 77-751" (PDF). DEPARTMENT OF THE INTERIOR: UNITED STATES GEOLOGICAL SURVEY. 1977. pp. 16, 85, 98.
↑ "America's Volcanic Past: Colorado". Vancouver, Washington: USGS: Cascades Volcano Observatory (CVO). |chapter= ignored (help)

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Needle Rock Natural Area

See also

References

External links