@misc{indiciae9746d2d9a317,
  title = {Calcareous nannofossils and forarninifers from Paleocene and Eocene strata in Maryland and Virginia},
  author = {L. M. Bybell and T. G. Gibson},
  year = {1991},
  url = {https://pubs.usgs.gov/publication/70186287},
  note = {Source identifier: 70186287}
}