@misc{indiciae5ac3e2bc1c7d,
  title = {Geologic age: using radioactive decay to determine geologic age},
  author = {U.S. Geological Survey},
  year = {1997},
  doi = {10.3133/70043861},
  url = {https://pubs.usgs.gov/publication/70043861},
  note = {Source identifier: 70043861}
}