@misc{indiciaec7f89341acd2,
  title = {Changes in stratigraphic nomenclature by the U.S. Geological Survey, 1968},
  author = {George Vincent Cohee and Robert Glenn Bates and W.B. Wright},
  year = {1970},
  doi = {10.3133/b1294a},
  url = {https://pubs.usgs.gov/publication/b1294A},
  note = {Source identifier: b1294A}
}