. Bulletins of American paleontology. Ordovician conodonts: Bergstrom and Sweet 2S7 obvious impress on the rock sequence. It is reasonable to assume that the environmental changes, whatever their nature, were basin- wide and that at least the major tluctuations m relative abundance of Phragmodus undatus were essentially contemporaneous events in all parts of the Cincinnati Region. 6 1 Z. rext-fig. 2. Relative-alniiulance logs of Plinujmodiis uuJatus for sections 60BCK and 61Z. The center line of each log is 50 percent and dashed horizon- tal lines bracket comparable inter\als in each

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. Bulletins of American paleontology. Ordovician conodonts: Bergstrom and Sweet 2S7 obvious impress on the rock sequence. It is reasonable to assume that the environmental changes, whatever their nature, were basin- wide and that at least the major tluctuations m relative abundance of Phragmodus undatus were essentially contemporaneous events in all parts of the Cincinnati Region. 6 1 Z. rext-fig. 2. Relative-alniiulance logs of Plinujmodiis uuJatus for sections 60BCK and 61Z. The center line of each log is 50 percent and dashed horizon- tal lines bracket comparable inter\als in each Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Paleontological Research Institution (Ithaca, N. Y. ); Columbia University. Ithaca, N. Y. , Paleontological Research Institution [etc. ]

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