Further data are given on the Dry Lake section of Mississippian and Pennsylvanian rocks in northern Utah. In a previous paper by the senior writer the Brazer formation (Mississippian) and Wells formation (Pennsylvanian) were recognized, and the Brazer was subdivided into numbered members. Study of additional fossil collections clarifies the correlation of the Brazer with other Mississippian formations of North America. Units 1 and 2 are now proved to be of Iowan age and the Iowan-Chesterian boundary is placed in unit 3. A notable aid to broader correlations is the discovery near the top of unit 2 of the Goniatites-Girtyoceras fauna previously cited by Miller and Furnish from many localities and formations elsewhere in the United States.

In the basal Wells formation at Dry Lake are early Pennsylvanian ("Bendian") rocks. These yield a faunule with strong affinities to that of the Morrow formation of Arkansas and Oklahoma. Above the "Bendian" rocks are Desmoinesian rocks with Wedekindellina n. sp. This Wedekindellina zone marks a horizon that is widely recognized in the Pennsylvanian formations of the west.