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The Gallup Sandstone represents one of a few regressive facies of a succession of Upper Cretaceous regressive-transgressive clastic wedges in northwest New Mexico. In the Gallup sag, the formation overlies the Mancos Shale and underlies and intertongues with the Crevasse Canyon Formation, and may be grouped vertically into lower sandstone-dominated, middle coal-bearing, and upper sandstone-dominated lithofacies intervals.

The lower sandstone-dominated lithofacies interval represents delta-front, barrier, and tidal environments. This lithofacies grades upward into the coal-bearing lithofacies interval that represents delta-plain and coastal-plain environments. Peat coals were formed in swamps in both interdistributary and floodplain areas; however, the thickest accumulations were...

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