@misc{indiciae927e54a0f099,
  title = {Section of Pierre Shale measured in the Florence and Canon City quadrangles, Colorado},
  author = {James R. Gill and W. A. Cobban and G. R. Scott and R.E. Burkholder},
  year = {1972},
  doi = {10.3133/ofr72131},
  url = {https://pubs.usgs.gov/publication/ofr72131},
  note = {Source identifier: ofr72131}
}