Upper Cenozoic Palomas Formation of south-central New Mexico

TitleUpper Cenozoic Palomas Formation of south-central New Mexico
Publication TypeConference Proceedings
Year of Publication1986
AuthorsLozinsky RP, Hawley JW
Conference NameNew Mexico Geological Guidebook, 37th Field Conference
Pagination239-247
Date Published1986
PublisherNew Mexico Bureau of Mines and Mineral Resources
Conference LocationTruth or Consequences, New Mexico
Call Number00184
Keywordsabstract, abstracts, conference, conference proceedings, conferences, geology, geomorphology, Palomas Formation, proceeding, proceedings
AbstractUpper Santa Fe Group deposits occurring in the Palomas, Engel, and San Marcial Basins of the southern Rio Grande rift are here named the Palomas Formation. The term "Palomas gravel" was first applied to Plio-Pleistocene basin fill in the region in 1907; however, the formation has never been formally defined. It consists mainly of alluvial-fan and coalescent-fan deposits (piedmont facies) and ancestral Rio Grande fluvial deposits (axial-river facies). Maximum thickness range from 100 to locally more than 130 m. Formation deposition probably began prior to 5 my and continued until 400,000-500,000 years ago. The formation can be distinguished from the other upper Santa Fe Group deposits by its extensive piedmont facies and relatively narrow belt of axial-river deposits. Older Santa Fe units (Miocene-latest Oligocene), which do not contain axial-river facies, occupy remnants of early rift basins that predate development of the present system of basins and uplifts.
Custom 1Socorro, New Mexico