Ouachita Mountains

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Ouachita Mountains
The Ouachita Mountains near Caney Creek, Arkansas
Highest point
Peak Mount Magazine
Elevation 2,753 ft (839 m)
Coordinates 35°10′01″N93°38′41″W / 35.167016203°N 93.644725919°W / 35.167016203; -93.644725919 Coordinates: 35°10′01″N93°38′41″W / 35.167016203°N 93.644725919°W / 35.167016203; -93.644725919
CountryUnited States
State Arkansas and Oklahoma
Parent range U.S. Interior Highlands

The Ouachita Mountains ( /ˈwɒʃɪtɔː/ ), simply referred to as the Ouachitas, are a mountain range in western Arkansas and southeastern Oklahoma. They are formed by a thick succession of highly deformed Paleozoic strata constituting the Ouachita Fold and Thrust Belt, one of the important orogenic belts of North America. [1] The Ouachitas continue in the subsurface to the southeast where they make a poorly understood connection with the Appalachians and to the southwest where they join with the Marathon area of West Texas. [1] Together with the Ozark Plateaus, the Ouachitas form the U.S. Interior Highlands. [2] The highest natural point is Mount Magazine at 2,753 feet. [3] [4]

Mountain range A geographic area containing several geologically related mountains

A mountain range or hill range is a series of mountains or hills ranged in a line and connected by high ground. A mountain system or mountain belt is a group of mountain ranges with similarity in form, structure, and alignment that have arisen from the same cause, usually an orogeny. Mountain ranges are formed by a variety of geological processes, but most of the significant ones on Earth are the result of plate tectonics. Mountain ranges are also found on many planetary mass objects in the Solar System and are likely a feature of most terrestrial planets.

Arkansas State of the United States of America

Arkansas is a state in the southern region of the United States, home to over 3 million people as of 2018. Its name is of Siouan derivation from the language of the Osage denoting their related kin, the Quapaw Indians. The state's diverse geography ranges from the mountainous regions of the Ozark and the Ouachita Mountains, which make up the U.S. Interior Highlands, to the densely forested land in the south known as the Arkansas Timberlands, to the eastern lowlands along the Mississippi River and the Arkansas Delta.

Oklahoma State of the United States of America

Oklahoma is a state in the South Central region of the United States, bordered by Kansas on the north, Missouri on the northeast, Arkansas on the east, Texas on the south, New Mexico on the west, and Colorado on the northwest. It is the 20th-most extensive and the 28th-most populous of the fifty United States. The state's name is derived from the Choctaw words okla and humma, meaning "red people". It is also known informally by its nickname, "The Sooner State", in reference to the non-Native settlers who staked their claims on land before the official opening date of lands in the western Oklahoma Territory or before the Indian Appropriations Act of 1889, which dramatically increased European-American settlement in the eastern Indian Territory. Oklahoma Territory and Indian Territory were merged into the State of Oklahoma when it became the 46th state to enter the union on November 16, 1907. Its residents are known as Oklahomans, and its capital and largest city is Oklahoma City.



Louis R. Harlan claimed that "Ouachita" is composed of the Choctaw words ouac for buffalo and chito for large, together meaning "country of large buffaloes". At one time, herds of buffalo inhabited the lowland areas of the Ouachitas. [5] Historian Muriel H. Wright wrote that "Ouachita" is composed of the Choctaw words owa for hunt and chito for big, together meaning "big hunt far from home". [6] According to the article Ouachita in the Encyclopedia of Oklahoma History and Culture, "Ouachita" comes from the French spelling of the Caddo word washita, meaning "good hunting grounds". [3]

Choctaw Native American people originally from the Southeastern United States

The Choctaw are a Native American people originally occupying what is now the Southeastern United States. Their Choctaw language belongs to the Muskogean language family group. Hopewell and Mississippian cultures, who lived throughout the east of the Mississippi River valley and its tributaries. About 1,700 years ago, the Hopewell people built Nanih Waiya, a great earthwork mound located in what is central present-day Mississippi. It is still considered sacred by the Choctaw. The early Spanish explorers of the mid-16th century in the Southeast encountered Mississippian-culture villages and chiefs. The anthropologist John R. Swanton suggested that the Choctaw derived their name from an early leader. Henry Halbert, a historian, suggests that their name is derived from the Choctaw phrase Hacha hatak.

American bison species of even-toed ungulates

The American bison or simply bison, also commonly known as the American buffalo or simply buffalo, is a North American species of bison that once roamed North America in vast herds. Their historical range, by 9000 BCE, is described as the great bison belt, a tract of rich grassland that ran from Alaska to the Gulf of Mexico, east to the Atlantic Seaboard as far north as New York and south to Georgia and per some sources down to Florida, with sightings in North Carolina near Buffalo Ford on the Catawba River as late as 1750. They became nearly extinct by a combination of commercial hunting and slaughter in the 19th century and introduction of bovine diseases from domestic cattle. With a population in excess of 60 million in the late 18th century, the species was down to 541 animals by 1889. Recovery efforts expanded in the mid-20th century, with a resurgence to roughly 31,000 animals today, largely restricted to a few national parks and reserves.


The Ouachita National Forest during the fall Ouachita Autumn .jpg
The Ouachita National Forest during the fall
Location of the Ouachita Mountains Ouachita Mountains topographic v1 locator.svg
Location of the Ouachita Mountains
Topographic map of the Ouachita Mountains Ouachita Mountains topographic v1.svg
Topographic map of the Ouachita Mountains

The Ouachitas are a major physiographic province of Arkansas and Oklahoma and are generally grouped with the Arkansas River Valley. Together with the Ozark Plateaus, the Ouachitas form the U.S. Interior Highlands, one of few mountainous regions between the Appalachians and Rockies. [2]

Arkansas River Valley Region in Arkansas, United States

The Arkansas River Valley is a region in Arkansas defined by the Arkansas River in the western part of the state. Generally defined as the area between the Ozark and Ouachita Mountains, the River Valley is characterized by flat lowlands covered in fertile farmland and lakes periodically interrupted by high peaks. Mount Magazine, Mount Nebo, and Petit Jean Mountain compose the Tri-Peaks Region, a further subdivision of the River Valley popular with hikers and outdoors enthusiasts. In addition to the outdoor recreational activities available to residents and visitors of the region, the River Valley contains Arkansas's wine country as well as hundreds of historical sites throughout the area.It is one of six natural divisions of Arkansas.

U.S. Interior Highlands mountainous region in the Central United States

The U.S. Interior Highlands is a mountainous region in the Central United States spanning northern and western Arkansas, southern Missouri, eastern Oklahoma, and extreme southeastern Kansas. The name is designated by the United States Geological Survey to refer to the combined subregions of the Ouachita Mountains and the Ozark Plateaus. The U.S. Interior Highlands is one of few mountainous regions between the Appalachians and Rockies.

Appalachian Mountains mountain range in the eastern United States and Canada

The Appalachian Mountains, often called the Appalachians, are a system of mountains in eastern North America. The Appalachians first formed roughly 480 million years ago during the Ordovician Period. They once reached elevations similar to those of the Alps and the Rocky Mountains before experiencing natural erosion. The Appalachian chain is a barrier to east–west travel, as it forms a series of alternating ridgelines and valleys oriented in opposition to most highways and railroads running east–west.


The Ouachitas are dominated by pine, oak, and hickory. [7] The shortleaf pine ( Pinus echinata ) and post oak ( Quercus stellata ) thrive in dry, nutrient-poor soil and are common in upland areas. The maple-leaf oak ( Quercus acerifolia ) is found at only four sites worldwide, all of which are in the Ouachitas. [7] Some native tree species, such as the eastern red-cedar ( Juniperus virginiana ), are colonizers of human-disturbed sites. [7]

<i>Pinus echinata</i> species of plant

Pinus echinata, the shortleaf pine, is a species of pine native to the eastern United States from southernmost New York State, south to northern Florida, west to eastern Oklahoma, and southwest to eastern Texas. The tree is variable in form, sometimes straight, sometimes crooked, with an irregular crown. This tree reaches heights of 20–30 metres (65–100 ft) with a trunk diameter of 0.5–0.9 metres.

<i>Quercus stellata</i> species of plant

Quercus stellata, the post oak or iron oak, is a North American species of oak in the white oak section. It is a slow-growing oak that lives in dry, poor soils, and is resistant to rot, fire, and drought. Interbreeding occurs among white oaks, thus many hybrid species combinations occur.

Quercus acerifolia is a rare North American species of oak in the red oak section Quercus section Lobatae in the beech family. It is endemic to the Ozark Mountains of the State of Arkansas in the south-central United States.

The Ouachita National Forest covers approximately 1.8 million acres of the Ouachitas. [8] It is one of the largest and oldest national forests in the Southern U.S., created through an executive order by President Theodore Roosevelt on December 18, 1907. [8] There are six wilderness areas within the Ouachita National Forest, which are protected areas designed to minimize the impacts of human activities. [9]

Ouachita National Forest

The Ouachita National Forest is a National Forest that lies in the western portion of Arkansas and portions of eastern Oklahoma.

Southern United States Cultural region of the United States

The southern United States, also known as the American South, Dixie, Dixieland, or simply the South, is a region of the United States of America. It is located between the Atlantic Ocean and the western United States, with the midwestern United States and northeastern United States to its north and the Gulf of Mexico and Mexico to its south.

Theodore Roosevelt 26th president of the United States

Theodore Roosevelt Jr. was an American statesman, politician, conservationist, naturalist, and writer who served as the 26th president of the United States from 1901 to 1909. He previously served as the 25th vice president of the United States from March to September 1901 and as the 33rd governor of New York from 1899 to 1900. As a leader of the Republican Party during this time, he became a driving force for the Progressive Era in the United States in the early 20th century. His face is depicted on Mount Rushmore, alongside those of George Washington, Thomas Jefferson, and Abraham Lincoln. In polls of historians and political scientists, Roosevelt is generally ranked as one of the five best presidents.


Bison and elk once found habitat in the Ouachita Mountains, but have since been extirpated. Today, there are large populations of white-tailed deer, coyote, and other common temperate forest animals. Though elusive, hundreds of black bear roam the Ouachitas. Several species of salamander are endemic to the Ouachitas and have traits that vary from one locale to another.

Bison genus of mammals

Bison are large, even-toed ungulates in the genus Bison within the subfamily Bovinae.

Elk Large antlered species of deer from North America and east Asia

The elk or wapiti is one of the largest species within the deer family, Cervidae, and one of the largest terrestrial mammals in North America and Northeast Asia. This animal should not be confused with the still larger moose to which the name "elk" applies in British English and in reference to populations in Eurasia.

White-tailed deer species of mammal

The white-tailed deer, also known as the whitetail or Virginia deer, is a medium-sized deer native to the United States, Canada, Mexico, Central America, and South America as far south as Peru and Bolivia. It has also been introduced to New Zealand, Cuba, Jamaica, Hispaniola, the Bahamas, the Lesser Antilles, and some countries in Europe, such as Finland, the Czech Republic, Romania and Serbia. In the Americas, it is the most widely distributed wild ungulate.


The Athens Piedmont consists of a series of low relief ridges, none exceeding 1,000 feet. It is located south of the Ouachitas and extends from Arkadelphia, Arkansas to the Arkansas-Oklahoma border. The Athens Piedmont runs through Clark, Howard, Pike, and Sevier counties in Arkansas and McCurtain County in Oklahoma.

The Caddo, Cossatot, and Missouri mountains are a high, compact group of mountains composed of the weather-resistant Arkansas Novaculite. They are located primarily in Montgomery and Polk counties, Arkansas. The highest natural point is Raspberry Mountain at 2,358 feet. The headwaters of multiple rivers are found in this area, including the Caddo, Cossatot, and Little Missouri rivers.

The Cross Mountains are located in Polk and Sevier counties, Arkansas and McCurtain County, Oklahoma. The highest natural point is Whiskey Peak at 1,670 feet.

The Crystal Mountains are located primarily in Montgomery County, Arkansas. They are so named because of the occurrence of some of the world's finest quartz. The Crystal Mountains are generally taller than the nearby Zig Zag Mountains, achieving elevations over 1,800 feet.

The Fourche Mountains are a long, continuous chain of mountains composed of the weather-resistant Jackfork Sandstone. They extend from Pulaski County, Arkansas to Atoka County, Oklahoma and are home to several popular sites of interest, including Pinnacle Mountain State Park near Little Rock, Arkansas. The highest natural point is Rich Mountain at 2,681 feet, which intersects the Arkansas-Oklahoma border near Mena, Arkansas. The Fourche Mountains form a major watershed divide between the Arkansas River Basin to the north and the Red River Basin to the south.

The Frontal Ouachita Mountains are located in the Arkansas River Valley and feature a number of isolated landforms. The highest natural point is Mount Magazine at 2,753 feet, which is also the highest natural point of the Ouachitas and U.S. Interior Highlands. The Frontal Ouachita Mountains are structurally quite different from the rest of the Ouachitas and are sometimes considered a separate range.

The Trap Mountains are located primarily in Garland and Hot Spring counties, Arkansas. The highest natural point is Trap Mountain at 1,310 feet.

The Zig Zag Mountains are located in Garland County, Arkansas and are home to the thermal springs of Hot Springs National Park. They are so named because of their unique chevron shape when viewed from above, the result of plunging anticlines and synclines. The Zig Zag Mountains are not exceptionally tall, but do reach heights over 1,400 feet.


Vertical strata in the eastern Ouachitas Ouachita Mountains rock outcrop.jpg
Vertical strata in the eastern Ouachitas
Cluster of Arkansas quartz crystals from the Ouachita Mountains WLA hmns Quartz Arkansas.jpg
Cluster of Arkansas quartz crystals from the Ouachita Mountains

The Ouachitas are formed by a thick succession of highly deformed Paleozoic strata constituting the Ouachita Fold and Thrust Belt, which outcrops for approximately 220 miles in western Arkansas and southeastern Oklahoma. [1] In a general sense, the Ouachitas are considered an anticlinorium because the oldest known rocks are located towards the center of the outcrop area. [10] The Ouachitas continue in the subsurface to the Black Warrior Basin of Alabama and Mississippi where they plunge towards the Appalachian Mountains. [11] To the southwest, the Ouachitas join with the Marathon area of west Texas where rocks of the Ouachita Fold and Thrust Belt are briefly exposed. [1]

Unlike many ranges in the United States, the Ouachitas are mostly east-west trending. They are unique because metamorphism and volcanism, features that are common in orogenic belts, are notably absent (with the exception of some low-grade metamorphism). Due to the high degree of folding and faulting, the Ouachitas are clustered into distinct subranges, with ridges separated by relatively broad valleys.

The Ouachitas are known for some of the world's finest quartz, especially around Mount Ida, Arkansas, the quartz capital of the world. [12] The quartz formed after the Ouachita Orogeny when fractures in rocks filled with silica-saturated fluids and, over millions of years, precipitated crystals up to several feet in length. The Ouachitas are also known for novaculite, a variety of chert that has undergone low-grade metamorphism; particular grades found only in Arkansas are used for making whetstones.


Cambrian through Mississippian strata of the Ouachitas were deposited in a narrow, two-sided basin called the Ouachita Trough, which formed as part of a Cambrian failed rift system. [1] [13] Succeeding Pennsylvanian strata of the Ouachitas were deposited in a foreland basin during the early stages of the Ouachita Orogeny. [14] Subduction of the South American Plate beneath the North American Plate resulted in this mountain-building event. [15] Compressional forces caused the crust to buckle, producing complex folds at all scale levels and several overturned sequences. [10] The area of greatest deformation occurred in the Benton-Broken Bow Uplift, which extends from Benton, Arkansas to Broken Bow, Oklahoma. [1] The total height of the Ouachitas is not known, though they may have exceeded 10,000 feet (based loosely on geologic cross-sections). [10] The terrain has been deeply eroded since the late Paleozoic. [1]


The Ouachitas are composed of Cambrian through Pennsylvanian sedimentary rocks. The Collier Shale, located at the core of the Benton-Broken Bow Uplift, is the oldest exposed formation of the Ouachitas. The Atoka Formation, which was deposited much later during the Pennsylvanian, has the largest areal extent of any of the Paleozoic formations in Arkansas. [10] The geologic formations of the Ouachitas are as follows (in order of ascending age).

FormationPeriodApproximate Thickness
Collier Shale Late Cambrian and Early Ordovician1,000 feet
Crystal Mountain Sandstone Early Ordovician850 feet
Mazarn Shale Early Ordovician2,500 feet
Blakely Sandstone Middle Ordovician700 feet
Womble Shale Middle Ordovician1,200 feet
Bigfork Chert Middle and Late Ordovician750 feet
Polk Creek Shale Late Ordovician225 feet
Blaylock Sandstone Silurian1,200 feet
Missouri Mountain Shale Silurian300 feet
Arkansas NovaculiteDevonian and Early Mississippian900 feet
Stanley Shale Mississippian10,000 feet
Jackfork Sandstone Early Pennsylvanian6,000 feet
Johns Valley Shale Early Pennsylvanian1,500 feet
Atoka Formation Early and Middle Pennsylvanian25,000 feet
Hartshorne Sandstone Middle Pennsylvanian300 feet
McAlester Formation Middle Pennsylvanian2,300 feet
Savanna Formation Middle Pennsylvanian1,600 feet
Boggy Formation Middle Pennsylvanian1,100 feet


The Ouachita Mountains contain the Ouachita National Forest, Hot Springs National Park and Lake Ouachita, as well as numerous state parks and scenic byways mostly throughout Arkansas. They also contain the Ouachita National Recreation Trail, a 223-mile-long (359 km) hiking trail through the heart of the mountains. The trail runs from Talimena State Park in Oklahoma to Pinnacle Mountain State Park near Little Rock. It is a well maintained, premier trail for hikers, backpackers, and mountain bikers (for only selected parts of the trail).

The Talimena Scenic Drive begins at Mena, and traverses 54 miles (87 km) of Winding Stair and Rich Mountains, long narrow east-west ridges which extend into Oklahoma. Rich Mountain reaches an elevation of 2,681 feet (817 m) in Arkansas near the Oklahoma border. The two lane winding road is similar in routing, construction, and scenery to the Blue Ridge Parkway of the Appalachian Mountains. [16]

Sites of interest

The South Fourche La Fave River, Ouachita Mountains, Arkansas Southfourchelafaveriver arkansas 001.jpg
The South Fourche La Fave River, Ouachita Mountains, Arkansas


The mountains were home to the Ouachita tribe, for which they were named. Later French explorers translated the name to its present spelling. The first recorded exploration was in 1541 by Hernando de Soto. Later, in 1804, President Jefferson sent William Dunbar and Dr. George Hunter to the area after the Louisiana Purchase. Hot Springs National Park became one of the nation's first parks in 1832. The Battle of Devil's Backbone was fought here at the ridge of the same name in 1863. In August 1990, the U.S. Forest Service discontinued clearcutting as the primary tool for harvesting and regenerating short leaf, pine and hardwood forests in the Ouachita National Forest.

Related Research Articles

Geology of the Appalachians

The geology of the Appalachians dates back to more than 480 million years ago. A look at rocks exposed in today's Appalachian Mountains reveals elongate belts of folded and thrust faulted marine sedimentary rocks, volcanic rocks and slivers of ancient ocean floor – strong evidence that these rocks were deformed during plate collision. The birth of the Appalachian ranges marks the first of several mountain building plate collisions that culminated in the construction of the supercontinent Pangaea with the Appalachians and neighboring Little Atlas near the center. These mountain ranges likely once reached elevations similar to those of the Alps and the Rocky Mountains before they were eroded.

Ozarks Highland region in central-southern United States

The Ozarks, also called the Ozark Mountains or Ozark Plateau, is a physiographic region in the U.S. states of Missouri, Arkansas, Oklahoma, and extreme southeastern Kansas. The Ozarks cover a significant portion of northern Arkansas and most of the southern half of Missouri, extending from Interstate 40 in Arkansas to the Interstate 70 in central Missouri.

Boston Mountains

The Boston Mountains is a Level III ecoregion designated by the Environmental Protection Agency (EPA) in the U.S. states of Arkansas and Oklahoma. Part of the Ozark Mountains, the Boston Mountains are a deeply dissected plateau. The ecoregion is steeper than the adjacent Springfield Plateau to the north, and bordered on the south by the Arkansas Valley. The Oklahoma portion of the range is locally referred to as the Cookson Hills.

Mount Magazine mountain

Mount Magazine, officially named Magazine Mountain, is the highest point of the U.S. Interior Highlands and the U.S. state of Arkansas, and is the site of Mount Magazine State Park. It is a flat-topped mountain or mesa capped by hard rock and rimmed by precipitous cliffs. There are two summits atop the mountain: Signal Hill, which reaches 2,753 feet (839 m), and Mossback Ridge, which reaches 2,700 ft (823.0 m).

Cossatot River river in the United States of America

The Cossatot River is an 89-mile-long (143 km) river in Howard, Polk and Sevier counties in the U.S. state of Arkansas.

Cossatot River State Park-Natural Area

Cossatot River State Park-Natural Area is a 5,299.65-acre (2,144.69 ha) Arkansas state park in Howard County and Polk County, Arkansas in the United States. The park follows a rough, undeveloped 12.5 miles (20.1 km) of the Cossatot River. The river itself is included in Arkansas's Natural and Scenic Rivers System and the National Park Service's list of National Wild and Scenic Rivers, making it a whitewater rafting destination. The rough nature of the river, including Class III, IV, and dangerous Class V rapids, make the park-natural area a popular destination for skilled canoeists, kayakers, and playboaters. The park became a part of the system in 1988 after the Arkansas Department of Parks and Tourism and Arkansas Natural Heritage Commission agreed to cooperative management after acquiring the property from the Weyerhaeuser Corporation.

St. Francois Mountains mountain in United States of America

The St. Francois Mountains in southeast Missouri are a mountain range of Precambrian igneous mountains rising over the Ozark Plateau. This range is one of the oldest exposures of igneous rock in North America. The name of the range is spelled out as Saint Francois Mountains in official GNIS sources, but it is sometimes misspelled in use as St. Francis Mountains to match the anglicized pronunciation of both the range and St. Francois County.

Clingmans Dome Mountain, highest peak in Tennessee

Clingmans Dome is a mountain in the Great Smoky Mountains of Tennessee and North Carolina, in the southeastern United States. At an elevation of 6,643 feet (2,025 m), it is the highest mountain in the Smokies, the highest point in the state of Tennessee, and the highest point along the 2,174-mile (3,499 km) Appalachian Trail. It is also the third highest point in mainland Eastern North America, after the nearby Mount Mitchell and Mount Craig.

Arbuckle Mountains mountain in United States of America

The Arbuckle Mountains are an ancient mountain range in south-central Oklahoma in the United States. They lie in Murray, Carter, Pontotoc, and Johnston counties. The granite rocks of the Arbuckles date back to the Precambrian Eon some 1.4 billion years ago which were overlain by rhyolites during the Cambrian Period. The range reaches a height of 1,412 feet above sea level. According to the U.S. Geological Survey (USGS):

The Arbuckles contain the most diverse suite of mineral resources in Oklahoma: limestone, dolomite, glass sand, granite, sand and gravel, shale, cement, iron ore, lead, zinc, tar sands, and oil and gas; all these minerals are, or have been, produced commercially.

Appalachian Plateau Series of rugged dissected plateaus in the eastern United States

The Appalachian Plateau is a series of rugged dissected plateaus located on the western side of the Appalachian Mountains. The Appalachian Mountains are a mountain range that run down the entire East Coast of the United States. The Appalachian Plateau is the northwestern part of the Appalachian Mountains, stretching from New York to Alabama. The plateau is a second level United States physiographic region, covering parts of the states of New York, Pennsylvania, Ohio, Maryland, West Virginia, Virginia, Kentucky, Tennessee, Alabama, and Georgia.


Novaculite, also called Arkansas Stone, is a microcrystalline to cryptocrystalline rock type that consists of silica in the form of chert or flint. It is commonly white to grey or black in color, with a specific gravity that ranges from 2.2 to 2.5. It is used in the production of sharpening stones. It occurs in parts of Arkansas, Oklahoma, and Texas, as well as in Japan and parts of the Middle East. The name novaculite is derived from the Latin word novacula, meaning a sharp knife, dagger, or razor in reference to its use in sharpening.

Geology of Texas

Texas contains a great variety of geologic settings. The state's stratigraphy has been largely influenced by marine transgressive-regressive cycles during the Phanerozoic, with a lesser but still significant contribution from late Cenozoic tectonic activity, as well as the remnants of a Paleozoic mountain range.

Ouachita National Recreation Trail

Ouachita National Recreation Trail is a 223-mile (359 km) long, continuous hiking trail through the Ouachita Mountains of Oklahoma and Arkansas. It is the longest backpacking trail in the Ouachita National Forest, spanning 192 miles across its length. Approximately 177 miles of the trail is in Arkansas and 46 miles of the trail is in Oklahoma. The trail is used by hikers, backpackers, hunters, and mountain bikers. It is a non-motorized single track trail open only to foot traffic and partially open to mountain bicycles. Segments opened to mountain bikes are from the western terminus of the Ouachita Trail at Talimena State Park to the Big Cedar trailhead on US Highway 259 at approximately Mile Marker (MM) 30.5 in Oklahoma, and from the Talimena Scenic Drive Trailhead at MM 54.1, east to Highway 7 at mile 160.4, north of Jessieville, Arkansas.

Geology of Pennsylvania

The Geology of Pennsylvania consists of six distinct physiographic provinces, three of which are subdivided into different sections. Each province has its own economic advantages and geologic hazards and plays an important role in shaping everyday life in the state. They are: the Atlantic Coastal Plain Province, the Piedmont Province, the New England Province, the Ridge and Valley Province, the Appalachian Plateau Province, and the Central Lowlands Province.

Little River (Red River tributary) river in Oklahoma and Arkansas, United States of America

The Little River is a tributary of the Red River, with a total length of 217 miles (349 km), 130 miles (210 km) in southeastern Oklahoma and 87 miles (140 km) in southwestern Arkansas. in southeastern Oklahoma and southwestern Arkansas in the United States. Via the Red, it is part of the watershed of the Mississippi River. Six large reservoirs impound the Little River and its tributaries. The drainage basin of the river totals 4,204 square miles (10,890 km2), 2,204 square miles (5,710 km2) in Oklahoma and 2,036 square miles (5,270 km2) in Arkansas. The Little River and its upper tributaries are popular for recreational canoeing and kayaking.

Black Warrior Basin geological feature in Alabama and Mississippi

The Black Warrior Basin is a geologic sedimentary basin of western Alabama and northern Mississippi in the United States. It is named for the Black Warrior River and is developed for coal and coalbed methane production, as well as for conventional oil and natural gas production. Coalbed methane of the Black Warrior Basin has been developed and in production longer than in any other location in the United States. The coalbed methane is produced from the Pennsylvanian Pottsville Coal Interval.

Flatside Wilderness

The Flatside Wilderness is a rugged 9,507-acre protected area in the U.S. state of Arkansas. It is one of six wilderness areas in the Ouachita National Forest and also the easternmost. Outdoor enthusiasts can enjoy the area in a number of ways, including an 8.9-mile hike of the Ouachita National Recreation Trail.

Pinnacle Mountain (Arkansas)

Pinnacle Mountain is the second highest natural point in Pulaski County, Arkansas and main attraction of the 2,356-acre Pinnacle Mountain State Park. It is located in the foothills of the Ouachita Mountains just outside of Little Rock, the capital and most populous city of Arkansas.

Arkansas Valley (ecoregion)

The Arkansas Valley is a Level III ecoregion designated by the Environmental Protection Agency (EPA) in the U.S. states of Arkansas and Oklahoma. It parallels the Arkansas River between the flat plains of western Oklahoma and the Arkansas Delta, dividing the Ozarks and the Ouachita Mountains with the broad valleys created by the river's floodplain, occasionally interrupted by low hills, scattered ridges, and mountains. In Arkansas, the region is often known as the Arkansas River Valley, especially when describing the history and culture of the region.


  1. 1 2 3 4 5 6 7 Morris, R.C. (1974). "Sedimentary and Tectonic History of the Ouachita Mountains". Special Publications of SEPM. 22: 120–142.
  2. 1 2 "A Tapestry of Time and Terrain". U.S. Geological Survey. Retrieved 2007-10-13.
  3. 1 2 Cole, S.R.; Marston, R.A. (2009). Encyclopedia of Oklahoma History and Culture. Oklahoma Historical Society.
  4. "MAG". NGS data sheet. U.S. National Geodetic Survey . Retrieved 2008-12-16.
  5. Harlan, L.R. (1834). "Notice of Fossil Bones Found in the Tertiary Formation of the State of Louisiana". Transactions of the American Philosophical Society. 4: 397–403. doi:10.2307/1004838.
  6. Wright, M.H. (1929). "Some Geographic Names of French Origin in Oklahoma". Chronicles of Oklahoma. 7 (2): 188–193.
  7. 1 2 3 "Trees". Central Arkansas Library System. Retrieved 2017-11-28.
  8. 1 2 "Ouachita National Forest". Central Arkansas Library System. Retrieved 2017-11-28.
  9. ""Wilderness Areas (Ouachita National Forest)" (PDF). U.S. Forest Service. Retrieved 2017-12-02.
  10. 1 2 3 4 "Stratigraphic Summary of the Arkansas River Valley and Ouachita Mountains". Arkansas Geological Survey. Retrieved 2017-10-26.
  11. Mellen, F.F. (1947). "Black Warrior Basin, Alabama and Mississippi". AAPG Bulletin. 31 (10): 1801–1816. doi:10.1306/3d933a55-16b1-11d7-8645000102c1865d.
  12. "Quartz Crystals". Arkansas Department of Parks & Tourism. Retrieved 2017-11-25.
  13. Lowe, D.R. (1985). "Ouachita Trough: Part of a Cambrian Failed Rift System". Geology. 13 (11): 790–793. doi:10.1130/0091-7613(1985)13<790:otpoac>2.0.co;2.
  14. Shanmugam, G.; Moiola, R.J. (1995). "Reinterpretation of Depositional Processes in a Classic Flysch Sequence (Pennsylvanian Jackfork Group), Ouachita Mountains, Arkansas and Oklahoma". AAPG Bulletin. 79 (5): 672–695. doi:10.1306/8d2b1b6a-171e-11d7-8645000102c1865d.
  15. Hatcher, R.D. Jr.; Thomas, W.A.; Viele, G.W., eds. (1989). The Appalachian-Ouachita Orogen in the United States (Geology of North America). Colorado: Geological Society of America.
  16. http://www.trais.com/tcatalog_trail.aspx?trailid=XFA101-040, accessed 11 Mar 2011

Further reading