@article{IRMNG:SourceID:201707, author = {Meek, F. B. and Worthen, A. H.}, journal = {Illinois Geological Survey}, pages = {289-565}, title = {Paleontology of Illinois}, url = {https://www.irmng.org/aphia.php?p=sourcedetails&id=201707}, volume = {3}, year = {1868} }