{"thcode":61,"term":{"code":502,"name":"absolute dating (geologic)","parent":501,"scope":"used for all geologic dating methods yielding numerical ages"},"uf":[],"bt":[{"code":501,"name":"geologic dating","parent":486,"scope":"used for all methods of dating geologic (or archaeologic) materials, including both absolute dating methods (yielding numerical ages) relative dating methods (for determining the relative order of geologic events)."},{"code":486,"name":"laboratory methods","parent":398,"scope":"used for all laboratory procedures in support of scientific investigations."},{"code":398,"name":"research method","parent":1,"scope":null},{"code":1,"name":"Marine Realms Information Bank (MRIB) keyword categories","parent":null,"scope":null}],"nt":[{"code":503,"name":"dendrochronological analysis","parent":502,"scope":"absolute dating method based on counting the annual growth rings in a sampled tree trunk; often used to date climatological events that affected the rate of growth in the tree."},{"code":504,"name":"radiometric dating","parent":502,"scope":"used for all absolute dating techniques based on analyzing the abundance of a radioactive isotope and its decay products in a given geologic (or archaeologic) sample."}],"rt":[{"code":701,"name":"geochronology","parent":639,"scope":"the science of determining the absolute ages of earth materials"}]}