@misc{indiciae257bfd8132f2,
  title = {Divisions of geologic time—Major chronostratigraphic and geochronologic units},
  author = {U.S. Geological Survey Geologic Names Committee},
  year = {2018},
  doi = {10.3133/fs20183054},
  url = {https://pubs.usgs.gov/publication/fs20183054},
  note = {Source identifier: fs20183054}
}