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.
H. B. Willman and T. C. Buschbach
Blackriveran Stage (Vanuxem, 1842, p. 38-45; Moore, 1949).
Named for the Black River in New York State.
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
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.
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