#dating  use of chemical analysis to estimate the age of geological specimens
  supertype:  #chemical_analysis__qualitative_analysis  the act of decomposing a substance into its constituent elements
  subtype:  #radiocarbon_dating__radiocarbondating__carbon_dating__carbon-14_dating  a chemical analysis used to determine the age of organic materials based on their content of the radioisotope carbon-14; believed to be reliable up to 40,000 years
  subtype:  #rubidium-strontium_dating  a method of dating based on the decay of rubidium-87 into the stable isotope strontium-87; rubidium-87 has a half-life of 47,000,000,000 years

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