{"thcode":4,"term":{"code":"1.4","name":"Volcanic ash","parent":"1","scope":"A fine pyroclastic material (under 2.0 mm in diameter).  The term usually refers to the unconsolidated material..."},"uf":[],"bt":[{"code":"1","name":"Unconsolidated material","parent":"0","scope":"A sediment that is loosely arranged or unstratified, or whose particles are not cemented together, found either at the surface or at depth."},{"code":"0","name":"Earth material","parent":null,"scope":"Geologic map unit classification (Bruce R. Johnson) version 6.2: A hierarchical classification of earth materials for digital geologic maps."}],"nt":[],"rt":[]}