The geology of Arkansas includes deep 1.4 billion year old igneous crystalline basement rock from the Proterozoic known only from boreholes, overlain by extensive sedimentary rocks and some volcanic rocks. The region was a shallow marine, riverine and coastal environment for much of the early Paleozoic as multi-cellular life became commonplace. At the end of the Paleozoic in the Permian the region experienced coal formation and extensive faulting and uplift related to the Ouachita orogeny mountain building event. Extensive erosion of new highlands created a mixture of continental and marine sediments and much of the state remained flooded even into the last 66 million years of the Cenozoic. In recent Pleistocene and Holocene time, glacial sediments poured into the region from the north, down major rivers, forming dunes and sedimentary ridges. Today, Arkansas has an active oil and gas industry, although hydraulic fracturing related earthquake swarms have limited extraction. Mining industries in the state also produce brines, sand, gravel and other industrial minerals.
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The ArkansasGeological Survey (AGS), formerly the ArkansasGeological Commission (AGC), is a government agency of the State ofArkansas. It is responsible...
Madrid area. Crowley's Ridge – Geological formation in the U.S. states ofArkansas and Missouri Earthquake prediction – Branch of seismology Eastern Tennessee...
in the Boston Mountains, 3.4 miles (5.5 km) east of Pettigrew, Newton County, Arkansas. Geologically, the area is a broad dome with the exposed core in...
92°W / 35; -92 (State ofArkansas) Arkansas (/ˈɑːrkənsɔː/ AR-kən-saw) is a landlocked state in the South Central region of the Southern United States...
Ouachitas, are a mountain range in western Arkansas and southeastern Oklahoma. They are formed by a thick succession of highly deformed Paleozoic strata constituting...
Crater of Diamonds State Park is a 911-acre (369 ha) Arkansas state park in Pike County, Arkansas, in the United States. The park features a 37.5-acre...
Garland County, Arkansas, adjacent to the city of Hot Springs, the county seat. Hot Springs Reservation was initially created by an act of the United States...
faulting of strata currently exposed in the Ouachita Mountains. The more extensive Ouachita system extends from the current range in Arkansas and Oklahoma...
Tripoli is mined just east of Hot Springs, Arkansas by the Malvern Minerals Company. Spearing, Darwin V. (1991). Roadside Geologyof Texas. Mountain Press...
miles (134,770 km2) of land. Arkansas is divided into 75 counties and contains 500 municipalities consisting of cities and towns as of the 2020 United States...
The Arkansas River is a major tributary of the Mississippi River. It generally flows to the east and southeast as it traverses the U.S. states of Colorado...
edu. Retrieved 2024-02-28. "Ordovician period of the Ozark Plateaus in Arkansas". www.geology.arkansas.gov. Retrieved 2024-02-28. CALVERT, WARREN L. (1962)...
Springs. Arkansas Highway 51 runs generally east–west through Magnet Cove. Geologyof Titanium-Mineral Deposits, Eric R. Force, Geological Society of America...
states of Texas and Oklahoma. It forms a short border between Texas and Arkansas before entering Arkansas. It forms much of the eastern border of Miller...
Formation is a geologic formation in Arkansas. It preserves fossils dating back to the Jurassic period. The Smackover Formation consists of oolitic limestones...
Fault is a fault located in the Crowley's Ridge area west of Marianna in eastern Arkansas.[citation needed] The discovery was first announced by seismologists...
geography ofArkansas varies widely. The state is covered by mountains, river valleys, forests, lakes, and bayous in addition to the cities ofArkansas. Hot...
University ofArkansas (U of A, UArk, or UA) is a public land-grant research university in Fayetteville, Arkansas. It is the flagship campus of the University...
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