@misc{indiciae71625f5758a6,
  title = {Stratigraphy and composition of the Sharon Springs Member of the Pierre Shale in western Kansas},
  author = {James R. Gill and William Aubrey Cobban and Leonard Gene Schultz},
  year = {1972},
  doi = {10.3133/pp728},
  url = {https://pubs.usgs.gov/publication/pp728},
  note = {Source identifier: pp728}
}