This is a Preliminary summary of the distribution of conodonts in Lower to Upper Ordovician, Middle and Upper Devonian, Mississippian, Pennsylvanian, and Permian strata in the Trans-Pecos area of West Texas. Conodonts are now known to occur in the following formations: El Paso (Lower Ordovician), Montoya (Upper Ordovician), Canutillo (Middle Devonian), Helms (Upper Mississippian), Rancheria (Lower Mississippian), Tesnus (in part Mississippian), Magdalena and Gaptank (both Pennsylvanian), and Wolfcamp (Lower Permian) Formations. In addition, previously described faunas from the Marathon (Lower Ordovician), Fort Pena and Woods Hollow (Middle Ordovician), Maravillas (Upper Ordovician), Caballos (Devonian) and Dimple (Lower Pennsylvanian) Formations have been re-studied. Comp risons of these conodont faunas have been made with similar conodont faunas in central and eastern United States, and in western Europe. Detailed biozones like those proposed by other workers for the Illinois basin and for western Europe have not yet been established in West Texas. Furthermore, the abundance of conodonts in the stratigraphic column in West Texas is considerably less than that of the central United States and Europe.

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