Author: RIGBY, J.K. ET AL.
Title: Sponges from the Ibexian (Ordovician) McKelligon Canyon and VictorioHills formations in the souther Franklin Mountains, Utah. /&/ Lower Ordovician sponges from the Manitou Formation in central Colorado.
Description: 1999. Brigham Young University, Geology Studies 44; pp. 103-133 & 135-153, 2+3 fig. 5+3 plts. plus two other short papers on Cambrian and Permian sponges from the same issue. Orig. extract, stapled, very good, 4to.

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