Paleozoic and Cretaceous lithostratigraphy, depositional environments; sedimentary petrology, especially carbonate rocks, conodont biostratigraphy, invertebrate paleontology (especially brachiopods, mollusks, echinoderms), vertebrate paleontology, late Cenozoic history of the Great Plains, Phanerozoic paleogeographic and paleoclimatic studies.
Witzke, B.J., and Bunker, B.J., 1996, Relative sea-level changes during Middle Ordovician through Mississippian deposition in the Iowa area, North American craton, in Witzke, B.J., Ludvigson, G.A., and Day, J., eds., Paleozoic Sequence Stratigraphy: Geological Society of America, Special Paper 306, p. 307-330.
Witzke, B.J., and Johnson, M.E., 1999, Silurian brachiopod and related benthic communities from carbonate platform and mound environments of Iowa and surrounding areas, in Boucot, A.J., and Lawson, J.D., eds., Paleocommunities: A Case Study from the Silurian and Lower Devonian: Cambridge University Press, p. 806-840.
Witzke, B.J., and Metzger, R.A., 2005, Ordovician conodonts and stratigraphy of the St. Peter Sandstone and Glenwood Shale, central United States: Bulletins of American Paleontology, no. 369, p. 53-91.