@misc{indiciaeeb06c5ee9856,
  title = {Distribution and stratigraphic significance of foraminifera and algae in well cores from Madison Group (Mississippian), Williston Basin, Montana},
  author = {William Jasper Sando and Bernard L. Mamet},
  year = {1981},
  doi = {10.3133/b1529f},
  url = {https://pubs.usgs.gov/publication/b1529F},
  note = {Source identifier: b1529F}
}