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In recent years, workers have become increasingly aware of the usefulness of sedimentary structures in paleoenvironmental reconstruction, particularly in strata where fossils are rare or absent. Non-fossiliferous or slightly fossilferous shales and sandstones comprise the bulk of the total thickness of Pennsylvanian rocks in Northern Illinois and are thus highly suited to this type of study. This paper provides a classification of internal sedimentary structures commonly seen in the Pennsylvanian rocks of northern Illinois, and relates these structures to environmental processes on the basis of previous work. I have observed most of the structures

Sedimentary structures from the Carbondale Formation (Middle Pennsylvanian) of Northern Illinois / Charles W. Shabica --.