The following stratigraphic columns illistrate generalized lithologic seaud to the Appalachiansck (Pennsylvanian) strata exposed from the mid-continent (Kansas) east (West Virginia). These sections exemplify just one of many cyclic packages oat of the Paleozoic known as cyclothems, that typify this region of North America during this (from Gastaldo et al., 1999). to the Ap 1. Using a pencil draw neat, solid lines to correlate lithostratigraphic units between the three sections LLINOIS BASIN WEST VIRGINIA KANSAS Fluvial Sandstone -TA Marine Shale Limestone Coals Paleosols Fluvial Sandstone approx 5 mMarine Shale 5. Pennsylvanian (Upper Carboniferous) strata in the region may be characterized by as many as 50 vertically stacked cyclothems. These strata were deposited during a time when continent- continent collision (the Alleghenian orogeny) was building the Appalachian and Ouachita Mountains, and when portions of the large Paleozoic continent known as Gondwanaland were experiencing extensive glaciation. Speculate on the possible mechanisms responsible for the short- term sea level cycles recorded in the North American cyclothems.