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Oxyaquic Vertic Hapludalf (fine, smectitic, hyperthermic)
This profile was photographed in Victoria County, Texas. The surface horizons, to a depth of 35 cm contain only 5 percent clay and rests abruptly over a Bt horizon of 43 percent clay dominated by montmorillonite. This causes water to perch in and above the Bt from more than 20 consecutive or 30 cumulative days in normal years and thus the Oxyaquic subgroup. The montmorillonite rich Bt horizon has linear extensibility of 6 or more cm and is identified by the Vertic subgroup. Although most subsoil horizons have chroma of 2 or less mottles no saturation from ground water is observed in normal years.
Oxyaquic Vertic Hapludalf (fine, smectitic, hyperthermic)
This profile was photographed in Victoria County, Texas. The surface horizons, to a depth of 35 cm contain only 5 percent clay and rests abruptly over a Bt horizon of 43 percent clay dominated by montmorillonite. This causes water to perch in and above the Bt from more than 20 consecutive or 30 cumulative days in normal years and thus the Oxyaquic subgroup. The montmorillonite rich Bt horizon has linear extensibility of 6 or more cm and is identified by the Vertic subgroup. Although most subsoil horizons have chroma of 2 or less mottles no saturation from ground water is observed in normal years.