Chazyan Stage
Lithostratigraphy: Knox Dolomite Megagroup
Chronostratigraphy: Paleozoic Erathem >>Ordovician System >>Champlainian Series >>Chazyan 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
Chazyan Stage (Emmons, 1842, p. 107; Grabau, 1989, p. 223).
Derivation
Named for Chazy, New York.
Other names
History/background
Type section
Type location
Type author(s)
Type status
Reference section
Reference location
Reference author(s)
Reference status
Stratigraphic relationships
Extent and thickness
In Illinois the Chazyan Stage includes only the Everton Dolomite, which is not exposed but is encountered in drilling in the southwestern part of the state.
Lithology
Core(s)
Photograph(s)
Contacts
Well log characteristics
Fossils
Age and correlation
The Everton is correlated with the type Chazyan on the basis of the fauna in the Everton type area in Arkansas and by subsurface tracing (Templeton and Willman, 1963).
Environments of deposition
Economic importance
Remarks
References
EMMONS, EBENEZER, 1842, Geology of New York, Part 2, comprising the survey of the second geological district: Albany, 437 p.
GRABAU, A. W., 1909, Physical and faunal evolution of North America during Ordovicic, Siluric, and early Devonic time: Journal of Geology, v. 17, p. 209-252.
TEMPLETON, J. S., and H. B. WILLMAN, 1963, Champlainian Series (Middle Ordovician) in Illinois: Illinois State Geological Survey Bulletin 89, 260 p.
ISGS Codes
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