From Morrow and Withrow, “This chert is of Middle Mississippian age and occurs throughout SE Iowa, and west-central Illinois. Burlington chert is characteristically white or very light gray in color and often fossiliferous.”
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NSHS ID: 001LS13
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State: Iowa
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County: Louisa
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Lithic Type: Burlington Chert
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Geology: Burlington Formation, Valmayeran Series, Mississippian