@misc{indiciae5ff146498688,
  title = {Palynostratigraphy of the Tullock Member (lower Paleocene) of the Fort Union Formation in the Powder River basin, Montana and Wyoming},
  author = {Douglas J. Nichols and Janet L. Brown},
  year = {1992},
  doi = {10.3133/b1917f},
  url = {https://pubs.usgs.gov/publication/b1917F},
  note = {Source identifier: b1917F}
}