@misc{indiciae1ca13854685d,
  title = {Some Jurassic ammonites from central Saudi Arabia},
  author = {R. W. Imlay},
  year = {1970},
  doi = {10.3133/pp643d},
  url = {https://pubs.usgs.gov/publication/pp643D},
  note = {Source identifier: pp643D}
}