Historical:Trentonian Stage

	Handbook of Illinois Stratigraphy
Series	Bulletin 95
Author	H. B. Willman, Elwood Atherton, T. C. Buschbach, Charles Collinson, John C. Frye, M. E. Hopkins, Jerry A. Lineback, Jack A. Simon
Date	1975
Link	Web page
PDF	PDF file
Store	ISGS Store

	Handbook of Illinois Stratigraphy
Series	Bulletin 95
Author	H. B. Willman, Elwood Atherton, T. C. Buschbach, Charles Collinson, John C. Frye, M. E. Hopkins, Jerry A. Lineback, Jack A. Simon
Date	1975
Link	Web page
PDF	PDF file
Store	ISGS Store

Chronostratigraphy: Paleozoic Erathem >>Ordovician System >>Champlainian Series >>Trentonian Stage
Allostratigraphy: Tippecanoe Sequence

Authors

H. B. Willman and T. C. Buschbach

Name Origin

The Trentonian Stage (Vanuxem, 1838, p. 257, 276, 283; Kay, 1948, p. 1411), named for Trenton Falls in New York State, is represented in Illinois by the strata of the Galena Group.

Correlation

They are correlated with the type Trentonian of New York on the bases of both faunal and lithologic similarity (Templeton and Willman, 1963).

Extent and Thickness

These rocks are present throughout most of Illinois (fig. O-21).

Fig. O-21 -- Thickness of the Galena Group.

Fossils

Trentonian strata are generally fossiliferous and the fauna contains many forms not found in the Blackriveran below or the Cincinnatian above.

References

KAY, MARSHALL, 1948, Summary of Middle Ordovician bordering Allegheny Synclinorium: American Association of Petroleum Geologists Bulletin, v. 32, p. 1397-1416.
TEMPLETON, J. S., and H. B. WILLMAN, 1963, Champlainian Series (Middle Ordovician) in Illinois: Illinois State Geological Survey Bulletin 89, 260 p.
VANUXEM, LARDNER, 1838, Second annual report of the geological survey of the third district of the state of New York: New York Geological Survey Annual Report 2, p. 253-286.

ISGS Codes

Stratigraphic Code	Geo Unit Designation
7540	--