[1] Dinosaur remains are among the fossils that have been recovered from the formation, although none have yet been referred to a specific genus.

The upper beds are massive and crossbedded, consisting of well-sorted, fine-grained, friable sandstone.

[1] The formation is interpreted as a marine littoral formation deposited during the final regression of the Western Interior Seaway from the San Juan Basin, with recognizable delta-front and barrier island facies.

[3] The regression was interrupted by at least three brief transgressions that produced tongues of the upper Pictured Cliff Sandstone in the northern San Juan Basin.

The gas likely originated both in the underlying Lewis Shale and the coal beds of the overlying Fruitland Formation.