@misc{indiciae35a7c7842742,
  title = {Changes in stratigraphic nomenclature by the U.S. Geological Survey, 1973},
  author = {George Vincent Cohee and W.B. Wright},
  year = {1975},
  doi = {10.3133/b1395a},
  url = {https://pubs.usgs.gov/publication/b1395A},
  note = {Source identifier: b1395A}
}