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Phylogeny, systematics, and biostratigraphy of the Ordovician Bryozoan genus Peronopora
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ABSTRACT-Specimens of Peronopora Nicholson. 1881, are abundant in Upper Ordovician rocks of the North American Midcontinent. Based on the positions of units in the Composite Conodont Standard Section, we have sampled 211 specimens over a stratigraphic interval of 9.1 million years. The average duration of sample spacing is 61,664 years but is commonly as small as 32,800 yr.
Thirty-four morphometric characters were measured in each specimen and were converted into multistate characters...
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