@misc{indiciaec027cfdda498,
  title = {Twin Creek limestone (Jurassic) in the western interior of the United States},
  author = {Ralph Willard Imlay},
  year = {1967},
  doi = {10.3133/pp540},
  url = {https://pubs.usgs.gov/publication/pp540},
  note = {Source identifier: pp540}
}