{"thcode":4,"term":{"code":"5.2","name":"Metasedimentary rock","parent":"5","scope":"A sedimentary rock that shows evidence of having been subjected to metamorphism."},"uf":[],"bt":[{"code":"5","name":"Metamorphic rock","parent":"0","scope":"A rock derived from pre-existing rocks by mineralogical, chemical, and\/or structural changes, essentially in the solid state, in response to marked changes in temperature, pressure, shearing stress, and chemical environment, generally at depth in the earth's crust."},{"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":"5.2.5","name":"Marble","parent":"5.2","scope":"A metamorphic rock consisting predominantly of fine- to coarse-grained recrystallized calcite and\/or dolomite, usually with a granoblastic, saccharoidal texture."},{"code":"5.2.1","name":"Meta-argillite","parent":"5.2","scope":"An argillite that has been metamorphosed."},{"code":"5.2.4","name":"Metaconglomerate","parent":"5.2","scope":"A metamorphic rock formed by recrystallization of a conglomerate."},{"code":"5.2.3","name":"Quartzite","parent":"5.2","scope":"A granoblastic metamorphic rock consisting mainly of quartz and formed by recrystallization of sandstone or chert by either regional or thermal metamorphism."},{"code":"5.2.2","name":"Slate","parent":"5.2","scope":"A compact, fine-grained metamorphic rock that possesses slaty cleavage and hence can be split into slabs and thin plates"}],"rt":[]}