{"thcode":4,"term":{"code":"2.1.1.2","name":"Shale","parent":"2.1.1","scope":"A laminated, indurated rock having more than 67% clay-sized minerals."},"uf":[],"bt":[{"code":"2.1.1","name":"Mudstone","parent":"2.1","scope":"A general term that includes claystone, siltstone, shale, and argillite, and that should be used only when the amounts of clay-sized and silt-sized particles are not known or specified, or cannot be precisely identified..."},{"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","name":"Sedimentary rock","parent":"0","scope":"A rock resulting from the consolidation of loose sediment that has accumulated in layers..."},{"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":"2.1.1.2.1","name":"Black shale","parent":"2.1.1.2","scope":"A dark, thinly laminated carbonaceous shale, exceptionally rich in organic matter (5% or more carbon content) and sulfide (esp. iron sulfide, usually pyrite), and often containing unusual concentrations of certain trace elements (U, V, Cu, Ni)."},{"code":"2.1.1.2.2","name":"Oil shale","parent":"2.1.1.2","scope":"A kerogen-bearing, finely laminated brown or black sedimentary rock that will yield liquid or gaseous hydrocarbon on distillation."}],"rt":[]}