During the Spathian rocks of the Thaynes Group were still being deposited in the Sonoma Foreland Basin. The sea spread southward onto the Moenkopi mudflats and the Virgin Limestone Formation was deposited within the red beds of the Moenkopi Group. The fossils below were found in the upper part of the Thaynes Group in the Confusion Range of western Millard County.
Idahocolumbites nevadi (Kummel) 1969
Tirolites cf. T. cassianus (Quenstedt)
Ussurites hosei Kummel 1969
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