@misc{indiciaed423c57f0b55,
  title = {Changes in stratigraphic nomenclature by the U.S. Geological Survey, 1979},
  author = {Norman F. Sohl and W.B. Wright},
  year = {1980},
  doi = {10.3133/b1502a},
  url = {https://pubs.usgs.gov/publication/b1502A},
  note = {Source identifier: b1502A}
}