@misc{indiciaea0ab43235501,
  title = {Stratigraphy and ammonite fauna of the Graneros Shale and Greenhorn Limestone near Pueblo, Colorado},
  author = {William Aubrey Cobban and G. R. Scott},
  year = {1972},
  doi = {10.3133/pp645},
  url = {https://pubs.usgs.gov/publication/pp645},
  note = {Source identifier: pp645}
}