@misc{indiciae8d78e0f4d7d8,
  title = {How old is the Isthmus of Panama?},
  author = {Anthony G Coates and Robert F. Stallard},
  year = {2013},
  doi = {10.5343/bms.2012.1076},
  url = {https://pubs.usgs.gov/publication/70171524},
  note = {Source identifier: 70171524}
}