{"thcode":4,"term":{"code":"2","name":"Sedimentary rock","parent":"0","scope":"A rock resulting from the consolidation of loose sediment that has accumulated in layers..."},"uf":[],"bt":[{"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":[{"code":"2.2","name":"Carbonate rock","parent":"2","scope":"A sedimentary rock composed of more than 50% by weight carbonate minerals."},{"code":"2.6","name":"Chemical sedimentary rock","parent":"2","scope":"A sedimentary rock composed primarily of material formed directly by precipitation from solution or colloidal suspension or by the deposition of insoluble precipitates."},{"code":"2.1","name":"Clastic rock","parent":"2","scope":"A composed principally of broken fragments that are derived from preexisting rocks or minerals and that have been transported some distance from their place of origin."},{"code":"2.7","name":"Coal","parent":"2","scope":"A readily combustible rock containing more than 50% by weight and more than 70% by volume carbonaceous material, formed by compaction and induration of variously altered plant remains..."},{"code":"2.3","name":"Mixed carbonate\/clastic rock","parent":"2","scope":"An undivided mixture of carbonate and clastic sedimentary rocks."},{"code":"2.8","name":"Mixed coal\/clastic rock","parent":"2","scope":"An undivided mixture of coal and clastic sedimentary rock."},{"code":"2.4","name":"Mixed volcanic\/clastic rock","parent":"2","scope":"An undivided mixture of volcanic rock and clastic sedimentary rock."},{"code":"2.5","name":"Phosphorite","parent":"2","scope":"A sedimentary rock with a high enough content of phosphate minerals to be of economic interest."}],"rt":[]}