{"thcode":2,"term":{"code":771,"name":"natural remanent magnetization analysis","parent":860,"scope":"Method which measures the intensity and direction of residual magnetism in rocks to determine their age and history."},"uf":[{"name":"natural remnant magnetization analysis","usewith":false}],"bt":[{"code":860,"name":"paleomagnetic analysis","parent":619,"scope":"Determination of the intensity and direction of residual magnetism in rocks to study changes in the earth's magnetic field during past geologic time."},{"code":619,"name":"laboratory methods","parent":734,"scope":"Techniques to analyze and test samples in a place equipped and designed for the work."},{"code":734,"name":"methods","parent":1,"scope":"Techniques, methods, procedures, or strategies for research, management, collection, or analysis of scientific information in USGS."},{"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":[],"rt":[{"code":470,"name":"geophysics","parent":291,"scope":"Branch of geology studying the physical characteristics and phenomena of the earth and its atmosphere."}]}