@misc{indiciaecadb66e30794,
  title = {Divisions of geologic time - Major chronostratigraphic and geochronologic units},
  author = {R. C. Orndorff and N. Stamm and S. Craigg and T. D’Erchia and L. Edwards and D. Fullerton and B. Murchey and L. Ruppert and D. Soller and B. Tew},
  year = {2009},
  url = {https://pubs.usgs.gov/publication/70033950},
  note = {Source identifier: 70033950}
}