H. B. Willman and T. C. Buschbach
The Blackriveran Stage (Vanuxem, 1842, p. 38-45; Moore, 1949) is 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)
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).
Although the Ancell strata contain few fossils, the Platteville strata contain many that are characteristic of Blackriveran strata in New York (fig. O-5).
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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