{"thcode":61,"term":{"code":194,"name":"geological features","parent":94,"scope":"features associated with a particular geologic phenomenon, origin, or interpretation."},"uf":[],"bt":[{"code":94,"name":"feature type","parent":1,"scope":null},{"code":1,"name":"Marine Realms Information Bank (MRIB) keyword categories","parent":null,"scope":null}],"nt":[{"code":195,"name":"accretionary wedge","parent":194,"scope":"deformed and metamorphosed sedimentary rocks that were scraped off the subducting plate and accreted to the overriding plate at a convergent plate boundary."},{"code":196,"name":"anticline","parent":194,"scope":"an upward fold with older strata in the core."},{"code":197,"name":"diapir","parent":194,"scope":"a subsurface structure in which buoyant, ductile earth materials pierce the overlying, more brittle earth materials."},{"code":199,"name":"earthquake zone","parent":194,"scope":"an area of recurrent seismic activity."},{"code":200,"name":"fault","parent":194,"scope":"a rock fracture with displacement."},{"code":201,"name":"formation","parent":194,"scope":"a rock unit sufficiently distinct to be mapped and correlated over a wide area."},{"code":202,"name":"fossil","parent":194,"scope":"the remains or traces of organisms preserved in rocks."},{"code":203,"name":"fracture","parent":194,"scope":"a mechanical break in rock, with or without displacement."},{"code":204,"name":"glacial till","parent":194,"scope":"poorly sorted rock debris deposited by a glacier."},{"code":206,"name":"hotspot","parent":194,"scope":"a persistent igneous source in the mantle, often expressed at the surface as a string of volcanoes formed sequentially as a lithospheric plate moves over the stationary hotspot."},{"code":207,"name":"intrusion","parent":194,"scope":"a subsurface igneous body that invades older rock."},{"code":208,"name":"joint","parent":194,"scope":"a rock fracture without displacement; often found in parallel sets."},{"code":209,"name":"karst","parent":194,"scope":"terrain underlain by soluble bedrock such as limestone or marble and characterized by caves, caverns, sinkholes, and disappearing streams."},{"code":210,"name":"landslide","parent":194,"scope":"used for slope failures including slumps, rockfalls, earth flows, and debris flows (\"mudslides\"), among others."},{"code":211,"name":"magma chamber","parent":194,"scope":"a reservoir of molten rock within the crust."},{"code":212,"name":"oil and gas seep","parent":194,"scope":"site where hydrocarbons escape to the surface under low pressure, following rock fractures or permeable strata."},{"code":213,"name":"ophiolite","parent":194,"scope":"uplifted and exposed oceanic crust and upper mantle."},{"code":214,"name":"outwash plain","parent":194,"scope":"a gently sloping surface underlain by sediment deposited by glacial meltwater."},{"code":215,"name":"petroleum deposit","parent":194,"scope":"subsurface accumulations of oil and oil sands."},{"code":216,"name":"plate","parent":194,"scope":"a large, rigid slab of crust and upper mantle, which moves slowly over the ductile asthenosphere."},{"code":217,"name":"plate boundary","parent":194,"scope":"used for three types of boundaries between lithospheric plates: divergent boundaries, where lithosphere is created; convergent boundaries, where lithosphere is destroyed; and transform boundaries, where lithospheric plates slide past one another."},{"code":218,"name":"rift","parent":194,"scope":"a deep crustal fissure."},{"code":219,"name":"rift zone","parent":194,"scope":"a zone of fissures associated with 1) crustal extension or 2) strike-slip faulting."},{"code":220,"name":"sediment","parent":194,"scope":"unconsolidated weathering products that have been eroded, transported, and deposited in another location."},{"code":221,"name":"soil","parent":194,"scope":"a mixture of weathering products and organic material that can support plant life."},{"code":223,"name":"spreading center","parent":194,"scope":"a divergent plate boundary, where new lithosphere is created; typically expressed at the surface as a mid-ocean ridge."},{"code":224,"name":"subduction zone","parent":194,"scope":"a convergent plate boundary, where one lithospheric plate dives beneath another and is consumed in the asthenosphere; typically expressed at the surface as a deep-sea trench."},{"code":225,"name":"syncline","parent":194,"scope":"a downward fold with younger strata in the core."},{"code":226,"name":"unconformity","parent":194,"scope":"a surface of erosion or nondeposition between strata, representing a significant gap in the geologic record."}],"rt":[]}