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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.
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The 1922 discovery of the Smackover oil field, after which the Smackover Formation is named, resulted in a sizeable oil boom in southern Arkansas. [ citation needed ] In addition to being a petroleum reservoir, as of 2015, the brine from the Smackover Formation is the only source of commercial bromine in the United States.
Arkansas is located in Tornado Alley, and as a result, a few of the most destructive tornadoes in U.S. history have struck the state. While sufficiently far from the coast to avoid a direct hit from a hurricane, Arkansas can often get the remnants of a tropical system , which dumps tremendous amounts of rain in a short time and often spawns ...
This list of the Paleozoic life of Arkansas contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Arkansas and are between 541 and 252.17 million years of age.
The Tokio Formation is a Late Cretaceous geologic formation in Arkansas and Oklahoma. [1] Named in 1919 by Hugh Dinsmore Miser and Albert Homer Purdue in their study of Arkansas. [2] They assigned the town of Tokio, Hempstead County, Arkansas as the type locality, but did not designate a stratotype for this unit. United States portal ...
Print/export Download as PDF; ... Geology of Arkansas (4 C, 12 P) P. Paleontology in Arkansas (8 P) Pages in category "Natural history of Arkansas"
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.