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12. The cephalopods of the Bighorn formation of the Wind River mountains of Wyoming
13. Chitinozoa from the Ordovician Viola and Fernvale limestones of the Arbuckle Mountains, Oklahoma
14. The Chopawamsic Formation-- : a new stratigraphic unit in the Piedmont of northeastern Virginia
15. The Chopawamsic Formation-- : a new stratigraphic unit in the Piedmont of northeastern Virginia
16. Cincinnati fossils : an elementary guide to the Ordovician rocks and fossils of the Cincinnati, Ohio, region
17. Clays Ferry formation (Ordovician) -- a new map unit in south-central Kentucky
18. Clays Ferry Formation (Ordovician) : a new map unit in south-central Kentucky
19. Cloridorme formation, Middle Ordovician flysch : northern Gaspé Peninsula, Quebec
20. Composition, clay mineralogy, and diagenesis of the Simpson Group (Middle Ordovician), Grady County, Oklahoma
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