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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.
The flora and fauna of the ridge seem more closely related to the Tennessee hills to the east than to the Ozark Mountains to the west. This unique habitat has been protected by the establishment of several state and city parks, the St. Francis National Forest, recreational lakes, and in 1997 a national scenic byway, the Crowley's Ridge Parkway.
The half of the state south of Little Rock is apter to see ice storms. Arkansas's record high is 120 °F (49 °C) at Ozark on August 10, 1936; the record low is −29 °F (−34 °C) at Gravette, on February 13, 1905. [16] Arkansas is known for extreme weather and frequent storms.
A rural Ozarks scene. Phelps County, Missouri The Saint Francois Mountains, viewed here from Knob Lick Mountain, are the exposed geologic core of the Ozarks.. The Ozarks, also known as the Ozark Mountains, Ozark Highlands or Ozark Plateau, is a physiographic region in the U.S. states of Missouri, Arkansas, and Oklahoma, as well as a small area in the southeastern corner of Kansas. [1]
USGS map colored by paleogeological areas and demarcating the sections of the U.S. physiographic regions: Laurentian Upland (area 1), Atlantic Plain (2-3), Appalachian Highlands (4-10), Interior Plains (11-13), Interior Highlands (14-15), Rocky Mountain System (16-19), Intermontane Plateaus (20-22), & Pacific Mountain System (23-25) The legend ...
Schumm, Stanley A. Channel Widening and Flood-Plain Construction along Cimarron River in Southwestern Kansas: Erosion and Sedimentation in a Semiarid Environment. Washington D.C.: Government Printing Office, 1963. ISBN B0007EFJLY; Schumm, Stanley A. River Variability and Complexity. New York: Cambridge University Press, 2005. ISBN 0-521-84671-4
Arêtes can also form when two glacial cirques erode headwards towards one another, although frequently this results in a saddle-shaped pass, called a col. [2] The edge is then sharpened by freeze-thaw weathering, and the slope on either side of the arête steepened through mass wasting events and the erosion of exposed, unstable rock. [3]
The valley wall prevents meltwater streams from flowing outward away from the glacial snout. Instead, glacial meltwater is diverted laterally along the ice margin and deposits sediments between the glacier and valley wall. [25] As the glacier retreats, the process may repeat creating a stepped slope or terrace referred to as a kame terrace.