A brachiopod--gastropod assemblage of Late Ordovician age from the Lone Mountain area, McGrath quadrangle, west-central Alaska contains 15 species of gastropods including Pseudocryptaenia? majewskei n. sp. and Trochonemella churkini n. sp. In addition to the typical Ordovician gastropods present, such as Maclurites, three genera previously known only from the Silurian were recovered: Euomphalopterus, Pseudophorus, and Oriostoma?. The fauna is from strata that have been interpreted by some as being allochthonous in relation to cratonic North America. The paleobiogeographic affinities of the gastropods are not conclusive by themselves, but are consistent with our view, supported by the paleobiogeographic affinities of other Paleozoic faunas of the region and lithofacies analysis and paleomagnetism, that these strata are part of a southwest-trending miogeoclinal belt that extends along the Paleozoic North American continental margin from Canada and east-central Alaska across the Tintina Fault into southwestern and Interior Alaska.