A MIDDLE PENNSYLVANIAN FAUNA FROM THE NACO FORMATION NEAR KOHL RANCH, CENTRAL ARIZONA

The Kohl Ranch locality, about 15 miles east-northeast of Payson in Gila County, has yielded great numbers of invertebrate marine fossils to amateur and student collecting groups for many years. Megafossil species include nine brachiopods, four bivalves, three gastropods, two crinoids, and one conularid, as well as several species of bryozoans. New species described are Paraconularia kohli, Myalina nacoensis, and Eirmocrinus jeani. The fauna occurs in beds of light brownish gray clacareous shaly siltstone and mudstone, is dominated by the brachiopods Composita subtilita and Anthracospirifer occiduus, and rep- resents a community living in relatively quiet water probably no greater than 15 to 20 meters in depth. Fusulinids characteristic of the Zone of Fusulina, including Fusulina socorroensis Needham, Wedekindellina cf. W. matura Thompson, and an undescribed species of Fusulina, occur in the 70-foot interval just below the horizons collected and suggest a Middle Pennsylvanian (Desmoinesian) age for the assemblage.