Abstract

The large number of classifications of the type Cincinnatian (Ordovician) are to a great extent variations of a few fundamental concepts. Each of these elements is at least 40 years old and founded in the more rigid stratigraphic faiths of those times. Progress in the understanding of the Cincinnatian requires a new look from the standpoint of modern stratigraphic principles; further rearrangement of older concepts and named units is fruitless.

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