@misc{indiciaed04089cfc82d,
  title = {Updated tops file for Cretaceous and lower Tertiary units, Piceance Basin, northwest Colorado},
  author = {Ronald C. Johnson and John D. Dietrich and Tracey J. Mercier},
  year = {2015},
  doi = {10.3133/ofr20151036},
  url = {https://pubs.usgs.gov/publication/ofr20151036},
  note = {Source identifier: ofr20151036}
}