@misc{indiciae5548620dc23b,
  title = {High-resolution 40Ar 39Ar chronology of Oligocene volcanic rocks, San Juan Mountains, Colorado},
  author = {M. A. Lanphere},
  year = {1988},
  doi = {10.1016/0016-7037(88)90212-8},
  url = {https://pubs.usgs.gov/publication/70013770},
  note = {Source identifier: 70013770}
}