TOWARD STANDARDIZATION OF PHANEROZOIC STRATIGRAPHIC NOMENCLATURE IN NEW MEXICO Steven M. Cather1, Kate E. Zeigler2, Greg H. Mack3 and Shari A. Kelley1 1New Mexico Bureau of Geology and Mineral Resources, New Mexico Institute of Mining and Technology, 801 Leroy Pl., Socorro, NM, 87801,
[email protected] 2Department of Natural Resources Management, New Mexico Highlands University, Las Vegas, NM, 87701 3Department of Geological Sciences, New Mexico State University, Las Cruces, NM, 88003 Recent decades have seen an unprecedented rate of change in the Phanerozoic stratigraphic nomenclature of New Mexico. At the same time, the state has experienced a dramatic resurgence of geologic quadrangle mapping, primarily facilitated by the National Geologic Mapping Act of 1992, which enabled the STATEMAP and EDMAP programs. The utility of the new stratigraphic nomenclature has not yet been adequately tested, and in some cases has been opposed by other researchers. Despite a lack of consensus among stratigraphers, it is desirable to have an agreed-upon nomenclature for the purpose of ongoing geologic mapping. We present here, from our perspective as geologic mappers, revisions to the Phanerozoic stratigraphic nomenclature of New Mexico. We hope our discussion will eventually lead to adoption of a standardized nomenclature, for the purposes of mapping, by the New Mexico Bureau of Geology and Mineral Resources, which administers the STATEMAP and EDMAP programs in New Mexico. Here we criticize, and suggest alternatives to, aspects of recent nomenclatural