@misc{indiciaef79827e31b62,
  title = {Changes in stratigraphic nomenclature by the U.S. Geological Survey, 1967},
  author = {George Vincent Cohee and Robert Glenn Bates and W.B. Wright},
  year = {1969},
  doi = {10.3133/b1274a},
  url = {https://pubs.usgs.gov/publication/b1274A},
  note = {Source identifier: b1274A}
}