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ILLINOIS STATE GEOLOGICAL SURVEY (2005)
BibTeX
@MISC{River-sg05illinoisstate,
author = {Ipgm Wood River-sg and David A. Grimley and Scott W. Lepley and William W. Shilts},
title = {ILLINOIS STATE GEOLOGICAL SURVEY},
year = {2005}
}
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Abstract
The Wood River Quadrangle is located in southwestern Illinois about 10 miles northeast of St. Louis. This area is mostly contained within the American Bottoms, a large alluvial valley of the Mississippi River, containing up to 125 feet of water-laid clay, silt, sand, and gravel above bedrock. The eastern and northeastern portion of the quadrangle contains glaciated uplands blanketed by thick loess. The relatively steep bluff edge between the uplands and the American Bottoms has up to 150 feet of relief. West of the bluffs is an extensive terrace at an elevation of about 430 to 440 feet, locally referred to as the Wood River Terrace (fig. 1). Coalescing alluvial fans, composed of reworked deposits of the highly erodible loess and transported by bluffside creeks, occur between this terrace and the base of the bluffs. No bedrock exposures are known to occur in the quadrangle (F.B. Denny and J.A. Devera, personal communication, 2001), although some underground coal mines occur in the eastern uplands (Barrett
Keyphrases
illinois state geological survey american bottom reworked deposit bluffside creek northeastern portion bedrock exposure underground coal mine extensive terrace thick loess j.a. devera eastern upland mississippi river erodible loess steep bluff edge southwestern illinois wood river terrace personal communication water-laid clay glaciated upland alluvial fan large alluvial valley wood river quadrangle f.b. denny
