North Table Mountain

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North Table Mountain
North Table Mountain from Lookout Mountain.jpg
View looking northeast from the top of Lookout Mountain.
Elevation 6,555 ft (1,998 m)[1][2]
Isolation 2.18 mi (3.51 km)[3]
Location
North Table Mountain is located in Colorado
North Table Mountain
North Table Mountain
Colorado
Location Jefferson County, Colorado, U.S.[4]
Range Front Range foothills[3]
Coordinates 39°47′30″N 105°12′03″W / 39.7915537°N 105.2007859°W / 39.7915537; -105.2007859Coordinates: 39°47′30″N 105°12′03″W / 39.7915537°N 105.2007859°W / 39.7915537; -105.2007859[1]
Topo map USGS 7.5' topographic map
Golden, Colorado[1]
Geology
Type Mesa
Climbing
First ascent 1840s by Black Kettle and tribe
Easiest route Quarry road up west slope

North Table Mountain is a mesa located immediately northeast of the city of Golden in Jefferson County, Colorado. Its most distinctive feature is its nearly flat cap that is formed by ancient Paleocene lava flows. It is separated from nearby South Table Mountain, which consists of the same geologic formation, by Clear Creek canyon.

North Table Mountain is a popular scenic and recreational destination in the Denver metro area, and it is preserved as public open space by Jefferson County and the Access Fund. Recent and ongoing projects by Jefferson County Open Space have resulted in the construction of several new trails and eliminated large numbers of unofficial trails.

Geology[edit]

Two early Paleocene lava flows cap North Table Mountain.

North Table Mountain is underlain by sedimentary rocks of the Denver Formation, which spans the interval from latest Cretaceous to early Paleocene time. An exposure of the Cretaceous-Paleogene boundary layer has been identified and documented on nearby South Table Mountain.[5]

Three prominent, columnar jointed, cliff-forming lava flows can be seen on North Table Mountain, one exposed part way up the northwest slope, and two that form its cap. The Ralston Dike, a body of intrusive monzonite located about 2 miles (3.2 km) to the northwest, probably represents the volcanic vent from which the flows erupted.[6] The flows are about 62 to 64 million years old according to radiometric dating, which places them in the early Paleocene epoch. Generally referred to as basaltic, they are classified either as monzonite (the lowest flow) and latite (the upper two flows),[6] or as shoshonite.[7] They contain the minerals augite, plagioclase, and olivine altered to serpentine, with accessory sanidine and/or orthoclase, apatite, magnetite, and biotite.[7]

Zeolite[edit]

Both North and South Table Mountain are known for the wide variety of zeolite minerals[1] that occur in vesicles in the second flow. These include analcime, thomsonite, mesolite, chabazite, and others.[7] Excellent specimens of the Table Mountain zeolites can be seen at the nearby Colorado School of Mines Geology Museum.[8]

Wildlife[edit]

Among the animals known to frequent the mesa through time, according to local newspaper accounts, are mountain sheep, mountain lions, deer, elk and more. Of these, most except for the mountain sheep continue to live upon the mountain today. Several areas are closed seasonally to protect several species of nesting raptors. In the late 19th century bees also nested in the cliffs.

Fire[edit]

On July 22, 2005, more than 200 acres (81 hectares) were set ablaze. Two fifteen-year-old boys were charged with first-degree felony arson and misdemeanor fourth-degree arson for lighting fireworks. They claimed to have shot off a Roman Candle, which started several small spot fires at the base of the north face. They fled the scene, but an area resident had witnessed the act and reported them to the police after the fire escalated, and they were soon found. The fire was contained later the same day, but it was summer with dry prairie grass conditions, so the fire had spread rapidly. It only burned one structure, a toolshed, and some other small miscellaneous pieces of property, but it cost more than 100,000 dollars (U.S. currency) to contain and extinguish.

Pictures[edit]

Located on the west side of the mesa is the high point, Lichen Peak (6555 ft).
Geologists examining an ancient stream bed deposit exposed below the lava flows on the western slopes of North Table Mountain.

See also[edit]

References[edit]

  1. ^ a b c "TABLE MOUNTAIN". NGS data sheet. U.S. National Geodetic Survey. Retrieved November 4, 2014. 
  2. ^ The elevation of North Table Mountain includes an adjustment of +0.969 m (+3.18 ft) from NGVD 29 to NAVD 88.
  3. ^ a b "North Table Mountain, Colorado". Peakbagger.com. Retrieved November 4, 2014. 
  4. ^ "North Table Mountain". Geographic Names Information System, U.S. Geological Survey. Retrieved November 4, 2014. 
  5. ^ Kauffman, E.G., Upchurch, G.R. Jr., and Nichols, D.J., 2005. The Cretaceous-Tertiary boundary at South Table Mountain near Golden, Colorado. In: Extinction Events in Earth History, Lecture Notes in Earth Sciences, vol. 30, p. 365-392.
  6. ^ a b Van Horn, R. 1957. Bedrock geology of the Golden Quadrangle, Colorado. U.S. Geological Survey, Map GQ-103.
  7. ^ a b c Kile D.E., 2004. Zeolites and associated minerals from the Table Mountains near Golden, Jefferson County, Colorado. Rocks and Minerals, vol. 79, no. 4, p. 218-238.
  8. ^ Bartos, P.J. 2004. Table Mountain zeolites: The Colorado School of Mines perspective. Rocks and Minerals, vol. 79, no. 4, p. 240-244.

External links[edit]