Andisol the Yamamagan

2/12 of USDA soil orders

Andisols are soils formed in volcanic ash and defined as soils containing high proportions of glass and amorphous colloidal materials, including allophane, imogolite and ferrihydrite. Andisols exhibit a highly variable chemical and mineralogical composition, reflecting that of their volcanic-ash precursors. These precursors include lava, pyroclastic (e.g., ash) flows and assemblages, and mudflows containing volcanic debris and volcanic alluvium or loess.

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