Abstract
Abstract New collections from measured sections provide much of the material for this study. Holcocystis, Atopocystis, and Stummelasma are erected as new genera. Atopocystis mucronata and Stummelasma sulfurense are new species; Holcocystis flexa (Stumm), Stummelasma lonense (Stumm), and S. antelopense (Merriam) are new combinations. Revised coral ranges are integrated with the standard Nevada conodont zones and brachiopod-based faunal intervals. A range chart for 33 Rugosa emphasizes their value for correlation in Icriodus, or brachiopod-poor biofacies of the Great Basin. It also shows that full recovery from the end Lockhovian/early Pragian coral crisis in the region was delayed until the start of the middle Emsian gronbergi Zone. The recovery was accomplished principally by radiation of the Breviphyllidae and Papiliophyllidae, and by immigration of cyathophyllid and other genera. Updated lists of Rugosa genera present in the Great Basin, Mackenzie, and Appohimchi provinces during the Pragian and early E...
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