SAWIN, Robert S.; FRANSEEN, Evan K.; WEST, Ronald R.; LUDVIGSON, Greg A.; WATNEY, W. Lynn. Clarification and Changes in Permian Stratigraphic Nomenclature in Kansas. Current Research in Earth Sciences, [S. l.], n. 254, p. 1–4, 2008. DOI: 10.17161/cres.v0i254.11839. Disponível em: https://journals.ku.edu/cres/article/view/11839.. Acesso em: 7 may. 2024.