ELT 191b
Soil Summary:
very deep, very gravelly sandy loam to sand surface soils over gravelly, very gravelly and extremely gravelly sandy loam to sand subsurface layers, soils are limy throughout, moderate to strong development (lime accumulation and cementation); other soils associated with draws and washes are very deep, very gravelly fine sands over extremely gravelly sands, limy throughout, little or no development (relatively recent alluvium); this unit is dominated by Pima County map units 67 (Redo very gravelly sand, 15 to 50 percent slopes) and 5 (Arizo-Riverwash complex, 0 to 3 percent slopes) which comprise 72% and 20% of the ELT, respectively
Geologic Materials:
alluvium and residuum associated with sandstone, siltstone, and conglomerate, undivided (QTs); Holocene piedmont alluvium, undivided (Qy); and middle to late Pleistocene piedmont alluvium, undivided (Qi) which comprise 71%, 19% and 7% of the unit, respectively
Landforms:
moderately dissected, deeply incised fan and pediment surfaces