Atherton, Elwood, et al. Handbook of Illinois Stratigraphy, Illinois State Geological
Survey, 1975.Nelson, R.S. and Malone,D.H. Stratigraphy and Economic Geology of the
LaSalle-Ottawa, Illinois area.Treworgy, Janis D.Geoscience."Mississippian Rocks in Illinois" and "Depostional
History of the Pennsylvanian Rocks in Illinois"Coal Geology of Illinois. Illinois Geological Survey, 1996.
http:// www.isgs.uiuc.edu/isgsroot/coalsec/coalgeo.htmlLaSalle, Peru Illinois Field Trip.
http://wsiwww/cso.uiuc.edu/courses/GEOL/iua/modules/lectures/resources/lect