VOLUME 39, 1993
$22.00
Beresi, M. S., and Rigby, J. K., The Lower Ordovician sponges of San Juan, Argentina, p. 1–63, 2 tables, 13 pls., 8 figs.
Chure, D. J., The first record of ichthyosaurs from Utah, p. 65–69, 1 pl.
Dattilo, B. F., The Lower Ordovician Fillmore Formation of western Utah: Storm-dominated sedimentation on a passive margin, p. 71–100, 36 figs.
Mehl, D., Rigby, J. K., and Holmes, S. R., Hexactinellid sponges from the Silurian-Devonian Roberts Mountains Formation in Nevada and hypotheses of hexactine-stauractine origin, p. 101–24, 7 tables, 13 figs.