|North Table Mountain|
View looking northeast from the top of Lookout Mountain.
|Elevation||6,555 ft (1,998 m)|
|Isolation||2.18 mi (3.51 km)|
|Location||Jefferson County, Colorado, U.S.|
|Parent range||Front Range foothills|
|Topo map|| USGS 7.5' topographic map |
|First ascent||1840s by Black Kettle and tribe|
|Easiest route||Quarry road up west slope|
North Table Mountain is a mesa on the eastern flank of the Front Range of the Rocky Mountains of North America. The 6,555-foot (1,998 m) mesa summit is located in North Table Mountain Park, 3.4 miles (5.5 km) north by east (bearing 9°) of downtown Golden, Colorado, United States, in Jefferson County.
The most distinctive feature of the mesa is its nearly flat cap that was formed by ancient Paleocene lava flows. It is separated from companion South Table Mountain, which consists of the same geologic formation, by Clear Creek.
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.
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.
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. 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), or as shoshonite. They contain the minerals augite, plagioclase, and olivine altered to serpentine, with accessory sanidine, orthoclase, apatite, magnetite, and biotite.
Both North and South Table Mountain are known for the wide variety of zeolite minerals that occur in vesicles in the second flow. These include analcime, thomsonite, mesolite, chabazite, and others.Excellent specimens of the Table Mountain zeolites can be seen at the nearby Mines Museum of Earth Science.
Among the animals known to frequent the mesa through time, according to local newspaper accounts [ citation needed ], are mountain sheep, coyotes, mountain lions, plenty of deer, elk, rattlesnakes, 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.
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.
The San Juan Mountains is a high and rugged mountain range in the Rocky Mountains in southwestern Colorado and northwestern New Mexico. The area is highly mineralized and figured in the gold and silver mining industry of early Colorado. Major towns, all old mining camps, include Creede, Lake City, Silverton, Ouray, and Telluride. Large scale mining has ended in the region, although independent prospectors still work claims throughout the range. The last large scale mines were the Sunnyside Mine near Silverton, which operated until late in the 20th century and the Idarado Mine on Red Mountain Pass that closed down in the 1970s. Famous old San Juan mines include the Camp Bird and Smuggler Union mines, both located between Telluride and Ouray.
Mount Jefferson is a stratovolcano in the Cascade Volcanic Arc, part of the Cascade Range in the U.S. state of Oregon. The second highest mountain in Oregon, it is situated within Linn County, Jefferson County, and Marion County and forms part of the Mount Jefferson Wilderness. Due to the ruggedness of its surroundings, the mountain is one of the hardest volcanoes to reach in the Cascades. It is also a popular tourist destination despite its remoteness, with recreational activities including hiking, backpacking, mountaineering, and photography. Vegetation at Mount Jefferson is dominated by Douglas fir, silver fir, mountain hemlock, ponderosa pine, lodgepole pine, and several cedar species. Carnivores, insectivores, bats, rodents, deer, birds, and various other species inhabit the area.
The Denver Basin, variously referred to as the Julesburg Basin, Denver-Julesburg Basin, or the D-J Basin, is a geologic structural basin centered in eastern Colorado in the United States, but extending into southeast Wyoming, western Nebraska, and western Kansas. It underlies the Denver-Aurora Metropolitan Area on the eastern side of the Rocky Mountains.
Ute Mountain, also known as Ute Peak or Sleeping Ute Mountain, is a peak within the Ute Mountains, a small mountain range in the southwestern corner of Colorado. It is on the northern edge of the Ute Mountain Ute Tribe Reservation. The Reservation forms the southwestern corner of the state and of Montezuma County.
The West Elk Mountains are a high mountain range in the west-central part of the U.S. state of Colorado. They lie primarily within the Gunnison National Forest, and part of the range is protected as the West Elk Wilderness. The range is primarily located in Gunnison County, with small parts in eastern Delta and Montrose counties.
Olallie Butte is a steep-sided shield volcano in the Cascade Range of the northern part of the U.S. state of Oregon. It is the largest volcano and highest point in the 50-mile (80 km) distance between Mount Hood and Mount Jefferson. Located just outside the Olallie Scenic Area, it is surrounded by more than 200 lakes and ponds fed by runoff, precipitation, and underground seepage, which are popular spots for fishing, boating, and swimming. The butte forms a prominent feature in the Mount Jefferson region and is usually covered with snow during the winter and spring seasons.
South Table Mountain is a mesa on the eastern flank of the Front Range of the Rocky Mountains of North America. Castle Rock, the 6,338-foot (1,932 m) summit of the mesa, is located on private property 0.56 miles (0.9 km) directly east of downtown Golden, Colorado, United States, in Jefferson County.
The Laramie Formation is a geologic formation of Late Cretaceous (Maastrichtian) age, named by Clarence King in 1876 for exposures in northeastern Colorado, in the United States. It was deposited on a coastal plain and in coastal swamps that flanked the Western Interior Seaway. It contains coal, clay and uranium deposits, as well as plant and animal fossils, including dinosaur remains.
The Siletz River Volcanics, located in the Oregon Coast Range, United States, are a sequence of basaltic pillow lavas that make up part of Siletzia. The basaltic pillow lavas originally came from submarine volcanoes that existed during the Eocene.
Uranium mining in Colorado, United States, goes back to 1872, when pitchblende ore was taken from gold mines near Central City, Colorado. The Colorado uranium industry has seen booms and busts, but continues to this day. Not counting byproduct uranium from phosphate, Colorado is considered to have the third largest uranium reserves of any US state, behind Wyoming and New Mexico.
Crested Butte is a prominent mountain summit in the Elk Mountains range of the Rocky Mountains of North America. The 12,168-foot (3,709 m) peak is located in Gunnison National Forest, 2.1 miles (3.4 km) northeast by east of the Town of Crested Butte in Gunnison County, Colorado, United States. Ski lifts and runs of the Crested Butte Mountain Resort occupy the north side of the mountain.
Lookout Mountain is a foothill on the eastern flank of the Front Range of the Rocky Mountains of North America. The 7,377-foot (2,249 m) peak is located in Lookout Mountain Park, 1.7 miles (2.7 km) west-southwest of downtown Golden in Jefferson County, Colorado, United States.
The following is an alphabetical list of articles related to the U.S. state of Colorado.
The Denver Formation is a geological formation that is present within the central part of the Denver Basin that underlies the Denver, Colorado, area. It ranges in age from latest Cretaceous (Maastrichtian) to early Paleocene, and includes sediments that were deposited before, during and after the Cretaceous-Paleogene boundary event.
Dinosaur Ridge is a segment of the Dakota Hogback in the Morrison Fossil Area National Natural Landmark located in Jefferson County, Colorado, near the town of Morrison and just west of Denver.
Needle Rock Natural Area is located at the western edge of the West Elk Mountains of Colorado. The surrounding terrain is characterized by laccolithic mountains flanked by precipitous cliffs, extensive talus aprons, forested mesas, canyons, and spacious, well-watered intermontane basins. Needle Rock is an intrusive plug of monzonite porphyry cropping out 3.5 miles (5.6 km) east-northeast of the Town of Crawford in Delta County, Colorado, United States. At an elevation of 7,797 feet (2,377 m), the towering rock spire stands 800 feet (240 m) tall above the floor of the Smith Fork of the Gunnison River valley. The massive rock feature originated in the Oligocene geological epoch when magma intruded between existing sedimentary rocks as the crown of a buried laccolith or possibly the underlying conduit of a laccolith. Subsequent erosion has exposed the prominent rock formation seen in the natural area today.
The geology of Colorado was assembled from island arcs accreted onto the edge of the ancient Wyoming Craton. The Sonoma orogeny uplifted the ancestral Rocky Mountains in parallel with the diversification of multicellular life. Shallow seas covered the regions, followed by the uplift current Rocky Mountains and intense volcanic activity. Colorado has thick sedimentary sequences with oil, gas and coal deposits, as well as base metals and other minerals.