The chert gravel study region includes Chase (CS), Butler (BU), Lyon (LY), Greenwood (GW), Osage (OS), Coffey (CF), Woodson (WO), Wilson (WL), Anderson (AN), Allen (AL), and Neosho (NO) counties in east-central Kansas, as well as portions of surrounding counties. Map obtained from the Kansas geological survey--see DASC.
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