Edenian Stage
Chronostratigraphy: Paleozoic Erathem >>Ordovician System >>Cincinnatian Series >>Edenian Stage
Allostratigraphy: Tippecanoe Sequence
Primary source
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)
H. B. Willman and T. C. Buschbach
Name
Original description
The Edenian Stage of the Cincinnatian Series (Newberry, 1873, table opp. p. 89; Twenhofel et al., 1954, chart).
Derivation
The Edenian Stage is based on the Eden Group, named for Eden Park in Cincinnati, Ohio.
Other names
History/background
Type section
Type location
Type author(s)
Type status
Reference section
Reference location
Reference author(s)
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Stratigraphic relationships
The Edenian Stage is the basal stage of the Cincinnatian Series. In Illinois the Edenian Stage includes the Cape Limestone and the lower part of the Scales Shale (essentially the part underlying the Upper Depauperate Zone), which consists of the Thebes Sandstone Member and probably the Orchard Creek Shale Member in extreme southern Illinois and the middle and lower parts of the Elgin Shale Member elsewhere.
Extent and thickness
Lithology
The presence of dark brown to nearly black shale is characteristic of the Elgin Shale Member and lower Edenian strata in the type region of the Cincinnatian.
Core(s)
Photograph(s)
Contacts
Well log characteristics
Fossils
Age and correlation
Environments of deposition
Economic importance
Remarks
References
NEWBERRY, J. S., 1873, General geological relations and structure of Ohio: Ohio Geological Survey Report 1, part 1, p. 1-167.
TWENHOFEL, W. H., et al., 1954, Correlation of the Ordovician formations of North America: Geological Society of America Bulletin, v. 65, p. 247-298.
ISGS Codes
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