@misc{indiciae2de460fbf0d6,
  title = {New evidence on the age of the top of the Madison Limestone (Mississippian), Bighorn Mountains, Wyoming and Montana},
  author = {William Jasper Sando and Bernard L. Mamet},
  year = {1974},
  url = {https://pubs.usgs.gov/publication/70232499},
  note = {Source identifier: 70232499}
}