@misc{indiciaecb3e626e614b,
  title = {Changes in stratigraphic nomenclature by the U. S. Geological Survey, 1977},
  author = {N. F. Sohl and W.B. Wright},
  year = {1978},
  doi = {10.3133/b1457a},
  url = {https://pubs.usgs.gov/publication/b1457A},
  note = {Source identifier: b1457A}
}