Striking cyclic lithologic variations, presumably representing cyclic sedimentary conditions, are world-wide in distribution and occur throughout a wide stratigraphic range. The sediments of the Pennsylvanian period have long been recognized as exemplifying such cyclic sedimentation. The present study concerns itself particularly with rocks ranging from the Marmaton group ... to the Shawnee group ...

A School of Natural Resources geologist and his historian wife have written two books on the geology seen by the Lewis and Clark expedition designed to be excellent field guides for those following the duos route during the journeys bicentennial. Lewis and Clark and the Geology of the Great Plains, a 126-page volume with 125 color illustrations, looks at all accessible stops made by the Corps of Discovery from southeastern Nebraska to the continental divide in Montana. Lewis and Clark and the Geology of Nebraska, 32 pages with 21 illustrations, examines more stops along the Nebraska reach of the Missouri River. Both offer photos of the sites and modern scientific explanations alongside journal quotations.