Conodont distribution, paleoecology, and preliminary biostratigraphy of the Upper Cherokee and Marmaton Groups (Upper Desmoinesian, Middle Pennsylvanian) from two cores in south-central Iowa, J. W. Swade, (edited by P. H. Heckel), 1985, 71 p, 19 figs., 3 pl. The Technical Information Series presents research results on a wide variety of geological studies. As its name implies, the series requires that the reader have some background in geologic concepts and terminology.