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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.
Accommodation zones may be located where older crustal structures intersect the rift axis. In the Gulf of Suez rift, the Zaafarana accommodation zone is located where a shear zone in the Arabian-Nubian Shield meets the rift. [6] Rift flanks or shoulders are elevated areas around rifts. Rift shoulders are typically about 70 km wide. [7]
The invertebrates of Arkansas's Cretaceous sea included clams, echinoids, oysters, and snails. [4] During the Cretaceous, Arkansas was home to Belemnitella, Exogyra, Ostrea, Turritella, and other marine invertebrates in the Arkadelphia area of Clark County. [1] Fish of the same age left behind teeth in the area near Saratoga in Hempstead County.
Oil exploration began in earnest in 1916 with an unsuccessful well east of El Dorado, in Union County (which at the time was known as Urbana County). A week after Samuel S. Hunter found modest amounts of oil in the Hunter No. 1 well near Stephens, Arkansas, the Constantin Oil and Refining Company found large amounts of oil and natural gas. Soon ...
The Little Missouri River is south of, and runs parallel to, the Caddo River, before flowing into the Ouachita River near Tates Bluff, Arkansas. The largest tributary of the Little Missouri River is the Antoine River. The Little Missouri River is intermittently navigable to small boats below its confluence with the Antoine River, although it is ...
Caddo River: 266 7.5: near Caddo Gap: upper course, larger downstream West Fork Point Remove Creek: 257 7.3: near Hattieville: Moro Creek: 256 7.2: near Fordyce: Bayou Macon: 240 6.8: near Eudora: South Fork of Little Red River: 238 6.7: near Clinton: Cossatot River: 187 5.3: near Vandervoort: upper course, larger downstream Richland Creek: 179 ...
The Ouachita Mountains (/ ˈ w ɒ ʃ ɪ t ɔː /), 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. [3]
The rift consists of three major basins and many smaller basins, less than 100 square kilometres (39 sq mi). The three major basins (from northernmost to southernmost) are the San Luis, Española, and Albuquerque basins. The rift's northern extent is delineated by the upper Arkansas River basin between Leadville and Salida, Colorado. Further ...