@misc{indiciae4fc30ceef2da,
  title = {Stratigraphic nomenclature databases for the United States, its possessions and territories},
  author = {M. E. MacLachlan and Cynthia R. Murdock and Marilyn L. Hubert},
  year = {1994},
  doi = {10.3133/ds6rel2},
  url = {https://pubs.usgs.gov/publication/ds6rel2},
  note = {Source identifier: ds6rel2}
}