Frenchman Mountain

Not to be confused with French Mountain.

Frenchman Mountain is a mountain located east of Las Vegas, Nevada. Made up of rocks similar to those found on the bottom of the Grand Canyon, Frenchman Mountain formed when faulting elevated and tilted the rocks followed by erosion, giving it its sharp triangular profile. The mountain provides an example of the Great Unconformity with the tilted Paleozoic Tapeats Sandstone^[3] underlain by Paleoproterozoic Vishnu Schist, which is some of the oldest rock on the North American continent, having been created about two billion years ago.

Frenchman Mountain
Frenchman Mountain
Highest point
Elevation	4,056 ft (1,236 m) NAVD 88^[1]
Prominence	1,972 ft (601 m)^[2]
Coordinates	36°10′45″N 114°59′51″W / 36.179181253°N 114.997611072°W / 36.179181253; -114.997611072^[1]
Geography
Frenchman Mountain
Location	Clark County, Nevada, U.S.
Topo map	USGS Frenchman Mountain, NV

The peak lies on a north to north-northeast trending ridge about 2000 feet above the nearby valleys. Sunrise Mountain lies 3.6 miles (5.8 km) to the northeast adjacent to Nellis Air Force Base. The north end of the McCullough Range about 12 miles (19 km) to the south has a parallel trend. The River Mountains lie to the southeast.^[4][5] State Route 147 crosses its northern slope. A geologically rich area called Rainbow Gardens is located to its southeast, as is an igneous laccolith, Lava Butte.^[6] The Frenchman Mountain Fault poses a significant earthquake danger to the Clark County region.^[7]

It is likely named after the Frenchman Mine, which itself was alleged to be the site of a stock scam by a Belgian immigrant (mistakenly assumed to be French).^[8] It is commonly referred to as Sunrise Mountain, the name of a smaller peak to the north of Frenchman Mountain, because the sun rises over it in some areas of Las Vegas. The area from Cheyenne Avenue and Boulder Highway and Lamb Boulevard is commonly known as Sunrise Manor Township CDP.

Local conservationists have proposed the area, along with Gypsum Cave and Sunrise Mountain, be protected as a national monument.^[9]

References

1. "Sunrise". NGS Data Sheet. National Geodetic Survey, National Oceanic and Atmospheric Administration, United States Department of Commerce. Retrieved November 22, 2008. Note: Though the name of the station is Sunrise it is on Frenchman Mountain.
2. "Frenchman Mountain, Nevada". Peakbagger.com. Retrieved April 3, 2008.
3. Joseph V. Tingle; Becky W. Purkey; Ernest M. Duebendorfer; Eugene I. Smith; Jonathan G. Price; Stephen B. Castor (March 1, 2002). Geologic Tours in the Las Vegas Area - Expanded Edition. Nevada Bureau of Mines and Geology Special Publication. University of Nevada, Reno. p. 56. ISBN 978-1-888035-07-0. OCLC 48248626. OL 3625640M. Wikidata Q57313732.
4. Nevada, Delorme Atlas and Gazetteer, 8th ed., 2012, P.70 ISBN 0-89933-334-6
5. Frenchman Mountain, Nevada, 7.5 Minute Topographic Quadrangle, USGS, 1970
6. "Geologic History of Lake Mead National Recreation Area". U.S. Geological Survey. April 6, 2007. Retrieved January 28, 2008.
7. Loss-Estimation Modeling of Earthquake Scenarios for Each County in Nevada Using HAZUS-MH. Frenchman Mountain Fault, M6.6 Earthquake Scenario (p.63); Nevada Bureau of Mines and Geology
8. . Revealing the Past. April 7, 2018. Archived from the original on June 1, 2020.
9. "Nevada's next national monument may be in east Las Vegas". Las Vegas Review-Journal. May 26, 2023. Retrieved June 6, 2023.

External links

 

Wikimedia Commons has media related to Frenchman Mountain.

• Rowland, S. (nda) Frenchman Mountain Great Unconformity site Department of Geoscience, University of Nevada, Las Vegas, Nevada.
• Rowland, S. (ndb) Geologic Map of Frenchman Mountain Department of Geoscience, University of Nevada, Las Vegas, Nevada.
• Rowland, S. (ndc) Frenchman Mountain and the Great Unconformity. Department of Geoscience, University of Nevada, Las Vegas, Nevada.
• Share, J. (2102a) The Great Unconformity of the Grand Canyon and the Late Proterozoic-Cambrian Time Interval: Part I - Defining It.
• Share, J. (2102a) The Great Unconformity and the Late Proterozoic-Cambrian Time Interval: Part II - The Rifting of Rodinia and the "Snowball Earth" Glaciations That Followed
• Timmons, M. K. Karlstrom, and C. Dehler (1999) . , pp. 29–32.
• "Frenchman Mountain". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved April 3, 2008.