Cerrillos and Spenlo soils have calcic horizons and should be classified Calciargids. Sundance soils have buried paleosol horizons. Teckla soils contain 35 to 70 percent porcelanite rock fragments below a 20 to 40 inch depth. In addition, the Bowbac, Cushman, Decolney, Forkwood, Fort, Hagerman, Harbord, Olney, Pokeman, Potts, Pugsley, Spangler, Sundance and Tekla series are in LRR-G and are more moist in May and June. The Redpen soils formed in eolian and alluvial materials derived from sandstone and shale of the Glen Canyon Group undivided and Chinle formations.
Redpen soils are on fan remnants on valley sides.
Slopes are 0 to 2 percent. Elevations range from 6,000 to 6,500 feet. The mean annual temperature is 49 to 54 degrees F., and the mean annual precipitation is 10 to 13 inches. The frost free period is 120 to 140 days. These are the Aparejo , Aquima , Mido , Padilla , the proposed Tintero , and Zia soils and the competing Penistaja series.