Distribution of Middle and Upper Ordovician conodonts in North America is marked by provincialism at many levels. Thus, although zonal sequences can be established in several regions, none is completely continental in scope. Conodonts in the eastern Appalachians are closely related to those of northern Europe and both are discussed by Bergström in another report in this volume. Synthesis of regional sequences west of the Appalachians permits recognition of 12 distinct faunas, composed largely of species known best or exclusively from North America. The lower four, in the Whiterock Stage, have been reported only from Cordilleran, Marathon, and Arbuckle sections....