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Kowalewski M, Payne JL, Smith FA, Wang SC, McShea DW, Xiao S, Novack-Gottshall PM, McClain CR, Krause RA, Boyer AG, Finnegan S, Lyons SK, Stempien JA, Alroy J, Spaeth PA. The geozoic supereon. Palaios. 2011 May 1;26(5):251–255.