@misc{indiciae80d1b0e9f196,
  title = {Stratigraphic sections across Upper Cretaceous Mancos Shale-Mesaverde Group boundary, eastern Utah and western Colorado},
  author = {James R. Gill and William James Hail},
  year = {1975},
  doi = {10.3133/oc68},
  url = {https://pubs.usgs.gov/publication/oc68},
  note = {Source identifier: oc68}
}