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Smith, L., Read, J., 2000. Rapid Onset of Late Paleozoic Glaciation on Gondwana: Evidence from Upper Mississippian Strata of the Midcontinent, United States. Geology 28, 279-282. doi:10.1130/0091-7613(2000)28<279:ROOLPG>2.0.CO;2

Smith, L., Read, J., 2001. Discrimination of Local and Global Effects on Upper Mississippian Stratigraphy, Illinois Basin, USA. Journal of Sedimentary Research 71, 985-1002. doi:10.1306/040501710985