	Authors	Year	Title
	Sandberg, Mason & Work	2001	Position of Kinderhookian-Osagean boundary in northeastern Kentucky and southern Ohio. Newsletter on Carboniferous Stratigraphy, 19: 23.
	Work & Manger	2002	Masonoceras, a new karagandoceratid ammonoid from the lower Mississippian (lower Osagean) of Kentucky. Journal of Paleontology, 76 (3): 574-577, 5 fig., Lawrence, KS.