@misc{indiciae4fb1228cdb15,
  title = {Changes in stratigraphic nomenclature by the U.S. Geological Survey, 1966},
  author = {George Vincent Cohee and Walter S. West and Lorna C. Wilkie},
  year = {1967},
  doi = {10.3133/b1254a},
  url = {https://pubs.usgs.gov/publication/b1254A},
  note = {Source identifier: b1254A}
}