This paper describes a large and well-preserved fauna of Foraminifera from the area of the Hex Formation which was described by Owen T. Marsh in 1960 in his paper, "Geology of the Orchard Peak area," Special Report 62, California Division of Mines, and provisionally classed as Upper Jurassic.

The present paper expresses the opinion, based upon the identification of megafossils not known to Marsh, that the Hex Formation is of Early Cretaceous age. These fossils are belemnites (known to Marsh), aucellas, and ammonites, in addition to the 104 species of Foraminifera. Of these Foraminifera, 82 are calcareous and 22 arenaceous. Of the calcareous species, only 3 are pelagic. Of all calcareous species, a large percentage is of the family Nodosariidae (formerly Lagenidae). Many of the species have not been described heretofore from California and a few are believed to be new. The collecting locality is the Devils Den area in the eastern half of Sec. 20 and western half of Sec 21, T. 25 S., R. 18 E., and the northern half of Secs. 31 and 32, T. 25 S., R. 18 E., M.D.B.M., southeaste n flank of Orchard Peak, in the northwestern corner of Kern County, California, the type area of the Hex Formation.

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