@misc{indiciaefefa1d4ec09f,
  title = {Uranium–Lead dating, opal},
  author = {Leonid A. Neymark},
  year = {2014},
  doi = {10.1007/978-94-007-6326-5\_263-1},
  url = {https://pubs.usgs.gov/publication/70188813},
  note = {Source identifier: 70188813}
}