{"thcode":4,"term":{"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."},"uf":[],"bt":[{"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":"2.1.7","name":"Coarse-grained mixed clastic rock","parent":"2.1","scope":"A mixture of clastic sedimentary rocks varying from siltstone to conglomerate, dominated by rocks containing coarse sand-sized or gravel-sized particles."},{"code":"2.1.5","name":"Conglomerate","parent":"2.1","scope":"A coarse-grained clastic sedimentary rock, composed of rounded to subangular fragments larger than 2 mm in diameter typically containing fine-grained particles in the interstices, and commonly cemented by calcium carbonate, iron oxide, silica, or hardened clay..."},{"code":"2.1.2","name":"Fine-grained mixed clastic rock","parent":"2.1","scope":"A mixture of clastic sedimentary rocks varying from mudstone to sandstone, dominated by rocks containing clay-sized or silt-sized particles"},{"code":"2.1.4","name":"Medium-grained mixed clastic rock","parent":"2.1","scope":"A mixture of clastic sedimentary rocks varying from siltstone to conglomerate, dominated by rocks containing sand-sized particles"},{"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":"2.1.8","name":"Olistostrome","parent":"2.1","scope":"A sedimentary deposit consisting of a chaotic mass of intimately mixed heterogeneous materials (such as blocks and muds) that accumulated as a semi-fluid body by submarine gravity sliding or slumping of unconsolidated sediments."},{"code":"2.1.3","name":"Sandstone","parent":"2.1","scope":"A medium-grained clastic sedimentary rock composed of abundant sand-sized fragments, which may have a finer-grained matrix (silt or clay), and which is more or less indurated by a cementing material..."},{"code":"2.1.6","name":"Sedimentary breccia","parent":"2.1","scope":"A breccia (coarse-grained clastic rock composed of angular broken rock fragments held together by a mineral cement or a fine-grained matrix) formed by sedimentary processes"}],"rt":[]}