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Willman, H. B., Elwood Atherton, T. C. Buschbach, Charles Collinson, John C. Frye, M. E. Hopkins, Jerry A. Lineback, and Jack A. Simon, 1975, Handbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p. ==Contributing author(s)== Elwood Atherton, Charles Collinson, and Jerry A. Lineback ==Name== ===Original description=== Hombergian Stage (Swann, 1963, p. 22, 70), derived from the Homberg Group (J. M. Weller, 1939). ===Derivation=== Named for Homberg, Pope County. ===Other names=== ===History/background=== ==Type section== ===Type location=== ===Type author(s)=== ===Type status=== ==Reference section== ===Reference location=== ===Reference author(s)=== ===Reference status=== ==Stratigraphic relationships== The Hombergian Stage is the middle stage of the Chesterian Series. ==Extent and thickness== ==Lithology== The Hombergian Stage includes strata from the top of the Beech Creek up to the top of the Glen Dean (fig. M-25). The limestones in this stage are typically light brownish gray, light gray, or buff to gray and many of them and their associated shales are abundantly fossiliferous. Red shales in the upper part of the Fraileys and the lower part of the Hardinsburg are extensive marker beds. <center> <gallery caption="" widths=250px heights=250px perrow=4> Figure_M-25.jpg|alt=Stratigraphic column showing Hombergian Stage within Chesterian Series (Figure M-25)|{{file:Figure_M-25.jpg}} </gallery> </center> ==Core(s)== ==Photograph(s)== ==Contacts== ==Well log characteristics== ==Fossils== The bryozoan ''Prismopora serrulata'' and the crinoid ''Pterotocrinus'' (fig. M-4) are typical Hombergian fossils. <center> <gallery caption="" widths=250px heights=250px perrow=4> Figure_M-4.jpg|alt=Fossil assemblages including bryozoans and crinoids characteristic of Hombergian Stage (Figure M-4)|{{file:Figure_M-4.jpg}} </gallery> </center> ==Age and correlation== ==Environments of deposition== ==Economic importance== ==Remarks== ==References== SWANN, D. H., 1963, Classification of Genevievian and Chesterian (Late Mississippian) rocks of Illinois: Illinois State Geological Survey Report of Investigations 216, 91 p.<br> WELLER, J. M., 1939, Mississippian System: Kansas Geological Society Guidebook, 13th Annual Field Conference, southwestern Illinois and southeastern Missouri, p. 131-137. {{Codes |membercode=4250 |geo_unit=-- }}

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