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The δ 13 C and δ 18 O values of well-preserved carbonate rhizoliths (CRs) provide detailed insights into changes in the abundance of C 3 and C 4 plants in response to approximately decadal-scale changes in growing-season climate. We performed stable isotope analyses on 35–40 CRs sampled at 1-cm intervals from an 18-cm-thick paleosol formed in southern Illinois during...
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