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Rock units of Eocene age in the southeastern San Rafael Mountains and eastern Santa Ynez Mountains have had a relatively consistent set of names for at least 20 years. In upward stratigraphic order, these units are the Sierra Blanca Limestone, Juncal Formation, Matilija Sandstone, Cozy Dell Shale, and Coldwater Sandstone. The last three originally were assigned subformational rank, but their recognition as formations is deemed valid on the basis of firmly established use of this higher rank designation and on the basis of their distribution as regionally mappable units. Although the precise age and correlation of each remains in doubt, new paleontologic evidence from the upper Mono Creek-Pine Mountain area suggests that together these formations represent much of early, all of middle, and part of late Eocene time. INTRODUCTION The stratigraphic nomenclature for rocks of Eocene age in the southeastern San Rafael Mountains, eastern Santa Ynez Mountains, and Pine Mountain area requires slight modification to conform to present knowledge of the distribution, succession, and ages of these strata. Recent detailed reconnaissance mapping along the Big Pine fault between Big Pine Mountain and San Guillermo Mountain (Vedder and others, 1971) also has demonstrated the need for formalization of names for early Tertiary rock units in that area and has provided new paleontologic information that is helpful in correlating these units with previously named units nearby. Dickinson (1969) also has recognized the need for standardized terminology for the rock units in the Sespe Creek-Pine

Revision of stratigraphic names for some Eocene formations in Santa Barbara and Ventura counties, California