{"thcode":2,"term":{"code":1103,"name":"stratigraphic sections","parent":287,"scope":"Vertical arrangement in layers of rock units whose sequence is used to study the geological history of the strata."},"uf":[{"name":"geologic sections","usewith":false},{"name":"geologic units","usewith":false},{"name":"sections (geologic)","usewith":false},{"name":"sections (stratigraphic)","usewith":false},{"name":"strata","usewith":false},{"name":"stratum","usewith":false}],"bt":[{"code":287,"name":"earth characteristics","parent":1174,"scope":"The measurable, definable properties and features of the earth."},{"code":1174,"name":"topics","parent":1,"scope":"Themes, subjects, and concerns for which USGS information resources are relevant."},{"code":1,"name":"Categories","parent":null,"scope":"Thematic terms for categorizing information resources.  This thesaurus is intended to support finding and understanding scientific information."}],"nt":[{"code":84,"name":"bedrock geologic units","parent":1103,"scope":"Units of consolidated (solid) rock that underlie soils or other unconsolidated materials."},{"code":452,"name":"geologic contacts","parent":1103,"scope":"Junctions of two different rock formations varying by type or age of rock, including faults, unconformities, and bedding planes."},{"code":2089,"name":"stratigraphic thickness","parent":1103,"scope":"Thickness of earth material layers or groups of such layers, often portrayed as isopachs (contours) or gridded data."},{"code":1127,"name":"surficial geologic units","parent":1103,"scope":"Rock units on the earth's surface."}],"rt":[{"code":459,"name":"geologic structure","parent":287,"scope":"General position of rocks in an area, and geometrical relationships among rocks."},{"code":1104,"name":"stratigraphy","parent":464,"scope":"Branch of geology concerned with the study of the formation, composition, ordering in time, and arrangement in space of stratified rocks."}]}