@misc{indiciae76a25f905e58,
  title = {Type sections and stratigraphy of the members of the Blackleaf and Marias River formations (Cretaceous) of the Sweetgrass arch, Montana},
  author = {William Aubrey Cobban and C. E. Erdmann and R. W. Lemke and E. K. Maughan},
  year = {1976},
  doi = {10.3133/pp974},
  url = {https://pubs.usgs.gov/publication/pp974},
  note = {Source identifier: pp974}
}