National Geologic Map Database
General Information
- Title: A regionally extensive altered air-fall ash for use in correlation of lithofacies in the Upper Cretaceous Williams Fork Formation, northeastern Piceance Creek and southern Sand Wash basins, Colorado
- Author(s): Brownfield, M.E., and Johnson, E.A.
- Publishing Organization: The Rocky Mountain Association of Geologists
- Larger Work: Stone, D.S., and Johnson, K.S., eds., New interpretations of northwest Colorado geology
- Publication Date: 1986
- Cross Section: None
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