Ecological Land Types within LTA 26.
ELT 26a
Soil Summary:
shallow or moderately deep to lime cemented layers, are dominantly very gravelly sandy loams or sandy clay loams with lime throughout, moderate development (lime accumulation); unit also includes bedrock influenced areas with soils mostly shallow to bedrock, in a complex of limy very gravelly over extremely cobbly loams with little or no development associated with limestone and better developed non-limy extremely channery loams over extremely channery clays related to phyllite; dominated by Pima County soil survey map units 65 (Powerline-Kimrose family complex, 10 to 35 percent slopes) and 42 (Mabray-Deloro-Rock outcrop complex, 20 to 65 percent slopes). These units comprise 80 and 12% of the ELT, respectively
Geologic Materials:
alluvium, colluvium and residuum associated with Coyote Wells facies of the Pantano Formation (Tpcw); Miocene to Quaternary conglomerate with colluvial veneer (QTsc); sandstone, siltstone, and conglomerate, undivided (QTs); Pantano Conglomerate, mixed (Tpl); and younger Holocene terraces and active channel deposits (Qy2) which comprise 40%, 21%, 11%, 5% and 5% of the ELT, respectively
Landforms:
moderately dissected, weakly to moderately incised fan and pediment surfaces
ELT 26b
Soil Summary:
shallow or moderately deep to lime cemented layers, are dominantly very gravelly sandy loams or sandy clay loams with lime throughout, moderate development (lime accumulation); also very deep soils with very gravelly fine sandy loam surfaces and dominantly very gravelly sandy loam and sandy clay loam subsurface layers, lime at or near the surface, moderate development (lime and clay accumulations); very deep recent undeveloped alluvial soils with sandy loam or clay loam textures are also included, depth to lime varies; dominated by Pima County soil survey map units 65 (Powerline-Kimrose family complex, 10 to 35 percent slopes), 51 (Nolam-Tombstone complex, 8 to 30 percent slopes) and 68 (Riveroad and Comoro soils, 0 to 2 percent slopes). These units comprise 47%, 24% and 16% of the ELT, respectively
Geologic Materials:
alluvium, colluvium and residuum associated with younger Holocene terraces and active channel deposits (Qy2); Miocene to Quaternary conglomerate with colluvial veneer (QTsc); Wakefield Canyon facies of Pantano Formation (Tpw); alluvium (Qi); and Aqua Verde facies of Pantano Formation (Tpav) which comprise 25%, 23%, 20%, 16% and 5% of the ELT, respectively
Landforms:
coarsely to moderately dissected, weakly incised fan and pediment surfaces
ELT 26c
Soil Summary:
very deep soils with very gravelly fine sandy loam and clay loam surfaces and dominantly very gravelly sandy loam, clay loam and sandy clay loam subsurface layers, lime at or near the surface, moderate development (lime and clay accumulations); dominated by Pima County soil survey map 51 (Nolam-Tombstone complex, 8 to 30 percent slopes) and 62 (Pinaleno very cobbly sandy loam, 1 to 8 percent slopes). These units comprise 64% and 15% of the ELT, respectively
Geologic Materials:
alluvium, colluvium and residuum associated with alluvium (Qi); basin fill deposits (QTs); and younger Holocene terraces and active channel deposits (Qy2) which comprise 46%, 33% and 8% of the ELT, respectively
Landforms:
undisssected and coarsely dissected, weakly incised fan and pediment surfaces
ELT 26d
Soil Summary:
shallow or moderately deep to lime cemented layers, are dominantly very gravelly sandy loams or sandy clay loams with lime throughout, moderate development (lime accumulation); unit also includes bedrock influenced areas with soils mostly shallow to bedrock, in a complex of limy very gravelly over extremely cobbly loams with little or no development associated with limestone and better developed non-limy extremely channery loams over extremely channery clays related to phyllite; dominated by Pima County soil survey map units 65 (Powerline-Kimrose family complex, 10 to 35 percent slopes) and 42 (Mabray-Deloro-Rock outcrop complex, 20 to 65 percent slopes). These units comprise 80 and 12% of the ELT, respectively
Geologic Materials:
alluvium, colluvium and residuum associated with Holocene piedmont alluvium, undivided (Qy); Pantano Formation (Tpc); late to latest Pleistocene piedmont alluvium (Qi3); middle to late Pleistocene piedmont alluvium (Qi2); Coyote Wells facies of the Pantano Formation (Tpcw); younger Holocene terraces and active channel deposits (Qy2); alluvium (Qi); and sandstone, siltstone, and conglomerate, undivided (QTs) which comprise 21%, 19%, 15%, 10%, 9%, 9%, 6% and 5% of the ELT, respectively
Landforms:
undissected and coarsely dissected, weakly incised fan and pediment surfaces