Trentonian Stage

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Chronostratigraphy: Paleozoic Erathem >>Ordovician System >>Champlainian Series >>Trentonian 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


Original description

Trentonian Stage (Vanuxem, 1838, p. 257, 276, 283; Kay, 1948, p. 1411).


The Trentonian Stage, named for Trenton Falls in New York State, is represented in Illinois by the strata of the Galena Group.

Other names


Type section

Type location

Type author(s)

Type status

Reference section

Reference location

Reference author(s)

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Stratigraphic relationships

Extent and thickness

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





Well log characteristics


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

Age and correlation

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

Environments of deposition

Economic importance



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