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Stuttgart soil series is an officially designated state symbol, the State Soil of Arkansas. Stuttgart soils are named for the City of Stuttgart in southeast Arkansas. They are used primarily for crops , mainly rice , soybeans , small grains , and corn .
During the Eocene, some bauxite was transported and a return to swampy conditions favored the formation of lignite low-grade coal. Throughout the Pliocene and Oligocene, the area experienced widespread erosion. Much of the soil and sediments near the surface in Arkansas formed during the last 2.5 million years of the Quaternary.
The Smackover Formation is a geologic formation that extends under parts of Arkansas, Louisiana, Texas, Alabama, Mississippi, and Florida. [1] It preserves fossils dating back to the Jurassic period. The formation is a relic of an ancient sea that left an extensive, porous, and permeable limestone geologic unit.
Crowley's Ridge (also Crowleys Ridge) is a geological formation that rises 250 to 550 feet (170 m) above the alluvial plain of the Mississippi embayment in a 150-mile (240 km) line from southeastern Missouri to the Mississippi River near Helena, Arkansas.
American soil scientist Hans Jenny published in 1941 [128] a state equation for the factors influencing soil formation: S = f(cl, o, r, p, t, ...) S soil formation; cl (sometimes c) climate; o organisms (soil microbiology, soil mesofauna, soil biology) r relief; p parent material; t time; This is often remembered with the mnemonic Clorpt.
The Moorefield Formation, or Moorefield Shale, is a geologic formation in northern Arkansas and eastern Oklahoma that dates to the Meramecian Series of the middle Mississippian. In Arkansas, this formation is generally recognized to have one member, the Ruddell Shale, in the upper Moorefield Formation.
About 1,000 soil subgroups are defined in the United States. [6] A soil family category is a group of soils within a subgroup and describes the physical and chemical properties which affect the response of soil to agricultural management and engineering applications. The principal characteristics used to differentiate soil families include ...
The Misener Sandstone Member in Appalachia is the formation's source. This phosphatic quartz sandstone is called the Sylamore Sandstone and is present in the Chattanooga interval also in eastern Oklahoma and northern Arkansas. These are supported by shale units, all different in composition and thickness at different locations. [13]