Ecological Land Types within LTA 171.

dominant soils are very deep, very gravelly fine sandy loam over very gravelly sandy clay loam subsoils or very gravelly and gravelly sandy loam subsurface layers, lime within a foot of the soil surface or throughout, moderate development (clay and/or lime accumulation); other soils are shallow and moderately deep to a caliche hardpan, have very gravelly sandy loam surfaces over very and extremely gravelly sandy loam and sandy clay loam subsurface layers, are limy throughout and have strong development (lime accumulation and cementation); unit dominated by Pima County soil survey map units 51 (Nolam-Tombstone complex, 8 to 30 percent slopes), 79 (Tombstone very gravelly loam, 15 to 50 percent slopes) and 65 (Powerline-Kimrose family complex, 10 to 35 percent slopes). These units comprise 40%, 31% and 12% of the ELT, respectively