No major stratigraphic gap exists near the Middle-Upper Pennsylvanian (Desmoinesian-Missourian) boundary in North America - Falcon-Lang, H.; Heckel, P.H.; DiMichele, William; Blake Jr., B.M.; Easterday, C.R.; Eble, C.F.; Elrick, S.; Gastaldo, Robert; Greb, S.F.; Martino, R.L.; John, Nelson; Pfefferkorn, H.W.; et al. (Palaios, 2011)