@misc{indiciaec51042901ae3,
  title = {Stratigraphy and paleogeographic significance of the Pennsylvanian-Permian Bird Spring Formation in the Ship Mountains, southeastern California},
  author = {Paul Stone and Calvin H. Stevens and Keith A. Howard and Thomas D. Hoisch},
  year = {2013},
  doi = {10.3133/sir20135109},
  url = {https://pubs.usgs.gov/publication/sir20135109},
  note = {Source identifier: sir20135109}
}