@misc{indiciae18166e166583,
  title = {Late Cenozoic stages and molluscan zones of the U.S. Middle Atlantic Coastal Plain},
  author = {B. W. Blackwelder},
  year = {2017},
  doi = {10.1017/s0022336000061862},
  url = {https://pubs.usgs.gov/publication/70011904},
  note = {Source identifier: 70011904}
}