{"thcode":25,"term":{"code":6,"name":"stratum","parent":2,"scope":"Terms indicating packages of earth materials that have a common characteristic such as age, composition, mode of formation or deformation."},"uf":[],"bt":[{"code":2,"name":"(subjects)","parent":1,"scope":"Distinct segments of human knowledge, such as place, time, or theme."},{"code":1,"name":"Categories","parent":null,"scope":"Characteristics applicable to entire controlled vocabularies.  We expect these terms to help people decide which vocabularies to use for particular purposes in the absence of official guidance."}],"nt":[],"rt":[]}