@misc{indiciaec17c6c83134a,
  title = {Paleontologic and stratigraphic relations of phosphate beds in Upper Cretaceous rocks of the Cordillera Oriental, Colombia},
  author = {Edwin K. Maughan and Francisco Zambrano O. and Pedro Mojica G. and Jacob Abozaglo M. and Fernando Pachon P. and Raul Duran R.},
  year = {1979},
  doi = {10.3133/ofr791525},
  url = {https://pubs.usgs.gov/publication/ofr791525},
  note = {Source identifier: ofr791525}
}