@misc{indiciae55fd73c7e272,
  title = {Changes in stratigraphic nomenclature by the U.S. Geological Survey, 1976},
  author = {Norman F. Sohl and W.B. Wright},
  year = {1977},
  doi = {10.3133/b1435a},
  url = {https://pubs.usgs.gov/publication/b1435A},
  note = {Source identifier: b1435A}
}