Blackriveran Stage

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

Blackriveran Stage (Vanuxem, 1842, p. 38-45; Moore, 1949).


Named for the Black River in New York State.

Other names


Type section

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Reference section

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Stratigraphic relationships

The Blackriveran Stage consists of the strata included in the Ancell and Platteville Groups, which are present throughout most of Illinois (fig. O-19)

Extent and thickness


Many of the distinctive lithologic units of the Platteville in Illinois have been traced to the Black River region in New York (Templeton and Willman, 1963).




Well log characteristics


Although the Ancell strata contain few fossils, the Platteville strata contain many that are characteristic of Blackriveran strata in New York (fig. O-5).

Age and correlation

Environments of deposition

Economic importance



MOORE, R. C., 1949, Introduction to historical geology: McGraw-Hill Book Co.. Inc., New York, 582 p.
TEMPLETON, J. S., and H. B. WILLMAN, 1963, Champlainian Series (Middle Ordovician) in Illinois: Illinois State Geological Survey Bulletin 89, 260 p.
VANUXEM, LARDNER, 1842, Geology of New York, part 3, comprising the survey of the third geological district: Albany, 306 p.

ISGS Codes

Stratigraphic Code Geo Unit Designation