Physical Geography

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Entries - Entry Category: Physical Geography - Starting with S

Saline River

The Saline River is known throughout the South for its scenic beauty and its unique characteristic of being a mountain stream at its origin in the Ouachita Mountains and a Delta-type bayou near its mouth at Felsenthal (Union County), where the stream converges with the Ouachita River. It is the last free-flowing river in the Ouachita basin. The river derived its name from a salty marsh located near its mouth, called by the French the “Marias Saline,” though some historians claim that a salt works started near Benton (Saline County) as early as 1827 gave the river its name. At one time, these salt works supplied the bulk of salt used in the territory as well as surrounding states. Although …

Soils

Arkansas has a diversity of rich soils that developed in a favorable environment for growing plants. The soils of Arkansas are the foundation of the number-one industry in the state—agriculture. Arkansas soils are natural, dynamic bodies of broken-down and weathered mineral and organic matter, in some places altered by human activity, capable of growing plants. Soils are unique and exist as a creation of five soil-forming factors: parent material, climate, topography, organisms, and time. Soil parent material is the geological source of the mineral component, defined as particles less than two millimeters in diameter. Arkansas soils developed from residium, loess, alluvium, and old marine sediment parent materials. Residium is weathered rock, and Arkansas’s residium is mostly soil derived from sandstone, …

Spring River

Flowing through northeastern Arkansas for approximately seventy-five miles in a southeastern direction, the Spring River empties into the Black River near Black Rock (Lawrence County). Mammoth Spring (Fulton County), adjacent to the Arkansas-Missouri state line, serves as the headwater for the Spring River. It expels more than nine million gallons of water each hour through a vent located eighty feet below the surface of Spring Lake, a low-turbidity body of water created by a dam downstream from the spring in what is now Mammoth Spring State Park. Although the water from the spring flows into the lake with great force, the vent’s depth prevents viewers on the surface from seeing the characteristic bubbling that springs typically produce. The consistent discharge …

Springs

Springs are naturally occurring geologic features that transport emerging groundwater to the land surface. They also represent a transition from groundwater to surface water. This water can be released through one opening, multiple openings, or numerous seeps in the rock strata or soil. Springs have unique properties such as discrete habitats with relatively constant conditions like temperature, dissolved oxygen concentration, and flow. The underground reservoirs from which springs arise may be cavernicolous limestone, gravel, sand, sediment, soil, or other permeable formations. A spring’s presence depends on the nature and relationship of permeable and impermeable units, the position of the water table, and the land topography. Faults often play an important role in the location of springs by damming up an …

St. Francis River

The St. Francis River originates in the northeast corner of Iron County, Missouri, and flows for twenty-five miles through the St. Francois Mountains, where it is a clear, fast-flowing whitewater stream until it reaches the Mississippi Alluvial Plain north of Poplar Bluff, Missouri, at which point the river becomes a sluggish, silt-laden stream. The river there turns south and travels 207 miles, forming the boundary between the Missouri bootheel and northeast Arkansas and then coursing between Crowley’s Ridge and the Mississippi River. The mouth of the St. Francis where it flows into the Mississippi is in the St. Francis National Forest just north of Helena-West Helena (Phillips County). The St. Francis River valley has been the site of human habitation …

Strawberry River

The Strawberry River rises southwest of Salem (Fulton County) and flows southeast from there for approximately ninety miles before emptying into the Black River in northeastern Independence County. The town of Strawberry (Lawrence County) takes its name from the river. Forty-three miles of the river have been have been designated part of the Arkansas Natural and Scenic Rivers System. The Strawberry River is a popular stream for canoeists and fishers. In addition to the smallmouth bass, the river is home to thirty-nine species of freshwater mussel, many of them rare, as well as the Strawberry River orangethroat darter (Etheostoma fragi), which lives only in this river system. The area around the Strawberry River has been the site of human habitation …

Sunken Lands

The term “sunken lands” (also called “sunk lands” or “sunk country”) refers to parts of Craighead, Mississippi, and Poinsett counties that shifted and sank during the New Madrid earthquakes which took place between 1811 and 1812. Because the land was submerged under water, claims to property based on riparian rights by large landowners generated controversy which lasted decades and ultimately reached the U.S. Supreme Court. When the New Madrid earthquakes began in December 1811, the territory which is today northeastern Arkansas was sparsely populated. An early chronicler described the earthquakes’ effect as the ground moving like waves on the land, when suddenly the earth would burst, sending up huge volumes of water and sand, leaving chasms where the earth had …