The Pomerado Conglomerate, the uppermost formation of the Poway Group, has a maximum thickness of 55 meters. It was named for exposures located at the divide between Carroll Canyon and Poway Valley along Pomerado Road east of the area in the Poway quadrangle (Peterson and Kennedy, 1974). The Pomerado Conglomerate is late Eocene in age and is a massive cobble conglomerate lithologically identical to the Stadium Conglomerate. The contact between the Mission Valley Formation and Pomerado Conglomerate is conformable and gradational. The Pomerado Conglomerate is characterized by occasional thin beds, lenses, and tongues of light-brown medium- grained sandstone. One of the largest of these, which crops out east of the area near Miramar Reservoir in the Poway quadrangle, is designated the Miramar Sandstone Member (Peterson and Kennedy, 1974). Lithologically the Miramar Sandstone Member is identical to the Mission Valley Formation but is stratigraphically higher and wholly contained within the Pomerado Conglomerate. It has a maximum thickness of 10 m in its type area and is considered to be late Eocene in age based on its superpositional relationship with the Pomerado Conglomerate and Mission Valley Formations.
The Pomerado Conglomerate is part of the Poway Group. The Poway Group (Poway Conglomerate of Hanna, 1926) includes three partly intertonguing and partially time equivalent formations, the Stadium Conglomerate, the Mission Valley For- mation, and the Pomerado Conglomerate. These rocks are primarily nonmarine in their easternmost exposures and nearshore marine and lagoonal in their westernmost exposures.

Source - Geology of the eastern San Diego metropolitan area, California (Del Mar, La Jolla, Point Loma, La Mesa, Poway, and SW 1/4 Escondido quadrangles), 1975, California Div. Mines and Geol. Bull. 200, Section A, by Michael P. Kennedy

References

Hanna, M.A., 1926, Geology of the La Jolla quadrangle, California: University of California, Dept. of Geol. Sci. Bull., v. 16, p. 187-246.
Peterson, G.L., and Kennedy, M.P., 1974, Lithostratigraphic variations in the Poway Group near San Diego, California: San Diego Soc. Nat. History Transactions, v. 17, p. 251-258.