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Three major ice centers formed in North America: the Labrador, Keewatin, and Cordilleran. The Cordilleran covered the region from the Pacific Ocean to the eastern front of the Rocky Mountains and the Labrador and Keewatin fields are referred to as the Laurentide Ice Sheet. Central North America has evidence of the numerous lobes and sublobes.
Water levels may have deepened in Arkansas with sand and clay depositing in a deep marine offshore trough environment in the Ouachita region, which shifted to siliceous ooze and clay by the Devonian. A shallow, near shore environment prevailed in the Ozarks, where thin layers of carbonates were interrupted by periodic erosion during the ...
Beginning around 11,700 B.C.E., the first indigenous people inhabited the area now known as Arkansas after crossing today's Bering Strait, formerly Beringia. [3] The first people in modern-day Arkansas likely hunted woolly mammoths by running them off cliffs or using Clovis points, and began to fish as major rivers began to thaw towards the end of the last great ice age. [4]
The Geological Survey of Arkansas was first established in 1857, at the direction of Governor Elias Nelson Conway. David Dale Owen was the agencies first geologist. Initially, the agency received funding for only three years, which limited the agencies findings and publications, and the agency was left without funding during the Civil War.
Rock glaciers are normally found at high latitudes and/or elevations, and may extend outward and downslope from talus cones, glaciers or terminal moraines of glaciers. [1] There are two types of rock glaciers: periglacial glaciers (or talus-derived glaciers), and glacial rock glaciers, such as the Timpanogos Glacier in Utah, which are often ...
The area that receives the most rain in the state is the area south of the Ouachita Mountains, which form an orographic effect (commonly known as rain shadow) when storms move north from the Gulf. The Arkansas Department of Environmental Quality (ADEQ) describes Arkansas's water resources by using six ecoregions. Of the six, the Boston Mountain ...
A glacier stream is a channelized area that is formed by a glacier in which liquid water accumulates and flows. [1] Glacial streams are also commonly referred to as "glacier stream" or/and "glacial meltwater stream". The movement of the water is influenced and directed by gravity and the melting of ice. [1]
Lake Agassiz (/ ˈ æ ɡ ə s i / AG-ə-see) was a large proglacial lake that existed in central North America during the late Pleistocene, fed by meltwater from the retreating Laurentide Ice Sheet at the end of the last glacial period.