Assigned to the newly named Nacimiento group as the upper formation in the Cuba area, Sandoval Co, NM in the San Juan basin. Not identified outside northwest NM. Unconformably? overlies Puerco formation, lower formation of Nacimiento group. Unconformably underlies Wasatch formation. Two measured sections described. The first is along the Puerco River south and west of Nacimiento (called Cuba by the PO) where the Torrejon is 276 ft thick and consists of tan to gray to brown sandstone that is interbedded with variegated, gray to yellowish shale. Some of the sandstone beds are massive; some are soft. Sandstone makes up 171 of the 276 ft section. The second is on the east fork of Arroyo Torrejon, 4 mi east of the Farmington road where Torrejon is 140 ft thick and consists of gray to black shale and soft, tan to gray sandstone. Shale makes up 104 ft of the 140 ft section. Not easily separated from the underlying Puerco except for "fossil evidence." Fossils: mammals, multituberculates, creodonts, insectivores, taeniodonts, condylarths, ambylopods, reptiles, birds, mollusks, flora; fossils listed; a Mesozoic fauna extinct in the Eocene. Same fossils found in MT in Fort Union-age rocks. Considered of Eocene age.

Source: GNU records (USGS DDS-6; Denver GNULEX).

Neither Puerco nor Torrejon recognized as formations in this report. One unit name, the Paleocene Nacimiento Formation, applied to rocks above the Ojo Alamo Sandstone (restricted). A Puerco and a Torrejon fauna shown as present in the Nacimiento.

Source: GNU records (USGS DDS-6; Denver GNULEX).