Calcareous foraminifera determined from thin-section studies of samples from a sequence of Devonian limestones in the Arrow Canyon Range of southern Nevada are assigned to three genera. These are: Eonodosaria Lipina, well represented from 575 feet to 765 feet below the top of the system; Tikhinella Bykova, found sporadically between 575 feet and 805 feet; a third, possibly new, genus, sparsely represented from 430 feet to 805 feet.

Representatives of these genera compare favorably with forms confined to limestones of late Frasnian age (Devonian) in the Russian platform, western Russia. The eonodosarians, in addition, are similar to forms of probable late Frasnian age from Kwang-si Province, south-central China.

On the basis of the similarity of the Nevada fossils to those from Russia and China, a late Frasnian age is suggested for a part of the Devonian limestone sequence in the Arrow Canyon Range.

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