Sections

Ecological Land Types within LTA 21.

ELT 21a

Elevation Range
Minimum: 
1043 m
Minimum in ft: 
3422 ft
Maximum: 
1074 m
Maximum in ft: 
3523 ft
Median: 
1062 m
Median in ft: 
3484 ft
Soil Summary: 
very deep, textures vary widely and soils are often stratified – very fine sandy loam to silty clay surfaces with very gravelly coarse sand to silty clay layers below, limy, no or little development, some high water tables on lower terraces; dominated by Cochise County, Northwestern Part soil survey units 48 (Hantz complex,Chihuahuan, 0 to 2 percent), 17 (Cascabel, Quiburi soils, and Riverwash, Chihuahuan, 0 to 5 percent slopes), 43 (Glendale-Hantz complex, Chihuahuan, 0 to 3 percent slopes), 40 (Gila-Glendale complex, Chihuahuan, 0 to 2 percent slopes), and 50 (Hantz silt loam, saline-sodic, 0 to 3 percent slopes). These units comprise 34%, 26%, 20%, 9% and 7% of the ELT, respectively
Geologic Materials: 
river alluvium associated with active channel and Holocene terraces (Qyr), late Holocene river deposits (Qy2r, Qy2f), Holocene alluvium (Qy), and late Holocene alluvium (Qy2) which comprise 25%, 30%, 28% and 17% of the LTA, respectively
Landforms: 
coarsely dissected, weakly to moderately incised mainly on river terrace breaks; terraces themselves show little dissection

ELT 21b

Elevation Range
Minimum: 
1013 m
Minimum in ft: 
3322 ft
Maximum: 
1067 m
Maximum in ft: 
3502 ft
Median: 
1031 m
Median in ft: 
3383 ft
Soil Summary: 
very deep, textures vary widely and soils are often stratified – very fine sandy loam to silty clay surfaces with very gravelly coarse sand to silty clay layers below, limy, no or little development, some high water tables on lower terraces; dominated by Cochise County, Northwestern Part soil survey units 48 (Hantz complex,Chihuahuan, 0 to 2 percent), 17 (Cascabel, Quiburi soils, and Riverwash, Chihuahuan, 0 to 5 percent slopes), and 40 (Gila-Glendale complex, Chihuahuan, 0 to 2 percent slopes). These units comprise 63%, 17% and 6% of the ELT, respectively
Geologic Materials: 
river alluvium associated with active channel and Holocene terraces (Qyr), late Holocene river deposits (Qy2r, Qy3r), and late Holocene alluvium (Qy2) which comprise 73%, 15% and 11% of the LTA, respectively
Landforms: 
coarsely dissected, weakly to moderately incised mainly on river terrace breaks; terraces themselves show little dissection

ELT 21c

Elevation Range
Minimum: 
970 m
Minimum in ft: 
3183 ft
Maximum: 
994 m
Maximum in ft: 
3261 ft
Median: 
980 m
Median in ft: 
3215 ft
Soil Summary: 
very deep, textures vary widely and soils are often stratified – very fine sandy loam to silty clay surfaces with very gravelly coarse sand to silty clay layers below, limy, no or little development, some high water tables on lower terraces; dominated by Cochise County, Northwestern Part soil survey units 40 (Gila-Glendale complex, Chihuahuan, 0 to 2 percent slopes), 48 (Hantz complex,Chihuahuan, 0 to 2 percent), 17 (Cascabel, Quiburi soils, and Riverwash, Chihuahuan, 0 to 5 percent slopes), and 19 (Casabel, Quiburi, and Typic Fluvaquents soils and Water, Chihuahuan, 0 to 5 percent slopes). These units comprise 41%, 29%, 18%, and 10% of the ELT, respectively
Geologic Materials: 
river alluvium associated with late Holocene river deposits (Qy2r) and late Holocene alluvium (Qy2) which comprise 61% and 38% of the ELT, respectively
Landforms: 
coarsely dissected, weakly to moderately incised mainly on river terrace breaks; terraces themselves show little dissection

ELT 21d

Elevation Range
Minimum: 
958 m
Minimum in ft: 
3142 ft
Maximum: 
1022 m
Maximum in ft: 
3353 ft
Median: 
964 m
Median in ft: 
3163 ft
Soil Summary: 
very deep, textures vary widely and soils are often stratified – very fine sandy loam to silty clay surfaces with very gravelly coarse sand to silty clay layers below, limy, no or little development, some high water tables on lower terraces; dominated by Cochise County, Northwestern Part soil survey units 44 (Glendale-Hantz complex,Sonoran, 0 to 3 percent), 18 (Cascabel, Quiburi soils, and Riverwash, Sonoran, 0 to 5 percent slopes), and 41 (Gila-Glendale complex, Sonoran, 0 to 2 percent slopes). These units comprise 32 %, 30% and 25% of the ELT, respectively
Geologic Materials: 
river alluvium associated with Holocene alluvium (Qy) which comprises 100% of the ELT
Landforms: 
coarsely dissected, weakly to moderately incised mainly on river terrace breaks; terraces themselves show little dissection

ELT 21e

Elevation Range
Minimum: 
958 m
Minimum in ft: 
3142 ft
Maximum: 
1013 m
Maximum in ft: 
3322 ft
Median: 
975 m
Median in ft: 
3199 ft
Soil Summary: 
very deep, textures vary widely and soils are often stratified – loamy sand to gravelly sandy loam surfaces with gravelly coarse sand to gravelly and very gravelly sandy loam layers below, lime content varies from none to limy throughout or within a foot of the surface, no or little soil development; dominated by Cochise County, Northwestern Part soil survey unit 2 (Agustin-Yturbide-Kokan complex, Sonoran, 1 to 8 percent slopes) which comprises 99% of the ELT, respectively
Geologic Materials: 
river alluvium associated with Holocene alluvium (Qy) which comprises 98% of the ELT
Landforms: 
coarsely dissected, weakly to moderately incised mainly on river terrace breaks; terraces themselves show little dissection

ELT 21f

Elevation Range
Minimum: 
932 m
Minimum in ft: 
3058 ft
Maximum: 
1057 m
Maximum in ft: 
3467 ft
Median: 
959 m
Median in ft: 
3146 ft
Soil Summary: 
very deep, textures vary widely and soils are often stratified – loamy sand to silt loam surfaces with very gravelly coarse sand to silty clay loam layers below, lime content varies from none to limy throughout or within a foot of the surface, no or little soil development, some high waters tables on lower terraces; dominated by Cochise County, Northwestern Part soil survey units 2 (Agustin-Yturbide-Kokan complex, Sonoran, 1 to 8 percent slopes), 66 (Queencreek-Riverwash complex, Sonoran, 0 to 5 percent slopes), 41 (Gila-Glendale complex, Sonoran, 0 to 2 percent slopes), 18 (Cascabel, Quiburi soils, and Riverwash, Sonoran, 0 to 5 percent slopes), 20 (Casabel, Quiburi, and Typic Fluvaquents soils and Water, Sonoran, 0 to 5 percent slopes), and 85 (Vinton-Gila complex, Sonoran, 0 to 3 percent slopes). These units comprise 46%, 19%, 10%, 8%, 7% and 7% of the ELT, respectively
Geologic Materials: 
river alluvium associated with late Holocene alluvium (Qy2,Qyc), active channel and Holocene terraces (Qyr), Holocene alluvium (Qy), and which comprise 45%, 37%, and 17% of the ELT, respectively
Landforms: 
coarsely dissected, weakly to moderately incised mainly on river terrace breaks; terraces themselves show little dissection

ELT 21g

Elevation Range
Minimum: 
899 m
Minimum in ft: 
2948 ft
Maximum: 
930 m
Maximum in ft: 
3050 ft
Median: 
906 m
Median in ft: 
2972 ft
Soil Summary: 
very deep, textures vary widely and soils are often stratified – loamy sand to silt loam surfaces with very gravelly coarse sand to silt loam layers below, lime content varies from none to limy throughout or within a foot of the surface, no or little soil development, some high waters tables on lower terraces; dominated by Cochise County, Northwestern Part soil survey units 18 (Cascabel, Quiburi soils, and Riverwash, Sonoran, 0 to 5 percent slopes), 2 (Agustin-Yturbide-Kokan complex, Sonoran, 1 to 8 percent slopes), 20 (Casabel, Quiburi, and Typic Fluvaquents soils and Water, Sonoran, 0 to 5 percent slopes), and 85 (Vinton-Gila complex, Sonoran, 0 to 3 percent slopes). These units comprise 38%, 29%, 17%, and 8% of the ELT, respectively
Geologic Materials: 
river alluvium associated with active channel and Holocene terraces (Qyr), late Holocene alluvium (Qy2) and Tcg and which comprise 60%, 20%, and 15% of the LTA, respectively
Landforms: 
coarsely dissected, weakly to moderately incised mainly on river terrace breaks; terraces themselves show little dissection

ELT 21h

Elevation Range
Minimum: 
774 m
Minimum in ft: 
2538 ft
Maximum: 
940 m
Maximum in ft: 
3083 ft
Median: 
834 m
Median in ft: 
2736 ft
Soil Summary: 
very deep, textures vary widely and soils are often stratified – very gravelly fine sand to loam surfaces with extremely gravelly sand to silty clay loam layers below, limy, no or little development; dominated by Pima County soil survey map units 30 (Glendale silt loam, 0 to 3 percent), 5 (Arizo-Riverwash complex, 0 to 3 percent), and 3 (Anthony fine sandy loam, 0 to 3 percent). These units comprise 46%, 27% and 25% of the ELT, respectively
Geologic Materials: 
river alluvium associated with modern river channel deposits (Qyc, Qycr), active channel and Holocene terraces (Qyr), and Holocene alluvium (Qy) which comprise 46%, 39% and 7% of the ELT, respectively
Landforms: 
coarsely dissected, weakly to moderately incised mainly on river terrace breaks; terraces themselves show little dissection

ELT 21i

Elevation Range
Minimum: 
1067 m
Minimum in ft: 
3501 ft
Maximum: 
1088 m
Maximum in ft: 
3569 ft
Median: 
1080 m
Median in ft: 
3543 ft
Soil Summary: 
very deep, textures vary widely and soils are often stratified – very fine sandy loam to silty clay surfaces with very gravelly coarse sand to silty clay layers below, limy, no or little development, some high water tables on lower terraces; dominated by Cochise County, Northwestern Part soil survey units 48 (Hantz complex,Chihuahuan, 0 to 2 percent), 50 (Hantz silt loam, saline-sodic, 0 to 3 percent slopes), 42 (Glendale silty clay loam, 0 to 1 percent slopes), and 17 (Cascabel, Quiburi soils, and Riverwash, Chihuahuan, 0 to 5 percent slopes). These units comprise 44%, 26%, 15%, and 14% of the ELT, respectively
Geologic Materials: 
river alluvium associated with Holocene alluvium (Qy) and active channel and Holocene terraces (Qyr) which comprise 84% and 16% of the ELT, respectively
Landforms: 
coarsely dissected, weakly to moderately incised mainly on river terrace breaks; terraces themselves show little dissection

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