@misc{indiciae11a689a07600,
  title = {Changes in stratigraphic nomenclature by the U.S. Geological Survey, 1969},
  author = {George Vincent Cohee and Robert G. Bates and W.B. Wright},
  year = {1970},
  doi = {10.3133/b1324a},
  url = {https://pubs.usgs.gov/publication/b1324A},
  note = {Source identifier: b1324A}
}