Stratigraphic and paleontologic studies in eastern Nevada and western Utah show that at least eight major marine and paralic fossil communities occur in rocks of Early Permian age. The eight communities, named for characteristic faunal elements, are: palaeotextulariid, fusulinid, coral, dictyoclostid-Composita, chonetoid, Heteralosia, nuculanid, and euphemitid. The palaeotextulariid, fusulinid, coral, dictyoclostid-Composita, and chonetoid communities probably required a salinity close to 35 per mil. The palaeotextulariid community probably lived at a depth of 50–70 m; fusulinid at 20–50 m; and coral at 10–30 m. The dictyoclostid-Composita and chonetoid communities may have lived at a depth of 4-10 m, the latter in a lower energy environment than the former. The Heteralosia, nuculanid, and euphemitid communities apparently were euryhaline and occupied very shallow bottoms.

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