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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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Historical timelines show the significant historical events and developments for a specific topic, over the course of centuries or millennia. Graphical timelines provide a visual representation for the timespan of multiple events that have a particular duration, over the course of centuries or millennia.
Humboldt orogeny – Geologic formation in Antarctica, (c. 3000 Ma) Insel orogeny – (2650±150 Ma) Early Ruker orogeny – (2000–1700 Ma) Late Ruker orogeny, also known as the Nimrod orogeny – (1000±150 Ma) Beardmore orogeny – (633–620 Ma) Ross orogeny – Paleozoic mountain building event in Antarctica – (c. 550 – c. 480 Ma)
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.
Ouachita Orogeny geologic map The Ouachita Mountains lie south of the Arkansas River valley which separates them from the Ozark plateau.. The Ouachita orogeny was a mountain-building event that resulted in the folding and faulting of strata currently exposed in the Ouachita Mountains.
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 prehistoric life of Arkansas contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Arkansas. Precambrian [ edit ]