[1][2] The Arroyo Ojito Formation is composed of sediments deposited from streams draining the Sierra Nacimiento, San Juan Basin, and southeastern Colorado Plateau.

[1] The formation is divided into the Navajo Draw, Loma Barbon, and Picuda Peak Member (in ascending stratigraphic order).

[2] The Loma Barbon Member is similar to the Navajo Draw, but is more poorly sorted and contains occasional mudstone beds.

[2] The beds assigned to the unit were originally included in the upper part of "middle red member" of the Santa Fe Formation by Kirk Bryan and Franklin McCann in 1937.

[6] Connell responded the next year by concurring with the promotion of the Ceja Formation (which he divided into Santa Ana Mesa and Atrisco Members), promoting the Cerro Conejo to formation rank, and retaining the middle beds as the Arroyo Ojito, divided into the Navajo Draw, Loma Barbon, and Picuda Peak Members.