Taylor, M.E., Landing, E., 1982. Biostratigraphy of the Cambrian-Ordovician Transition in the Bear River Range, Utah and Idaho, Western United States, in: Bassett, M.G., Dean, W.T. (Eds.), The Cambrianordovician Boundary: Sections, Correlations, Fossil Distributions, And Correlations. National Museum of Wales, pp. 131-139.