@misc{indiciae327149ab728e,
  title = {Age of Early Cretacous palynomorphs in the Muirkirk clay pit fossil locality (Prince Georges County, MD)},
  author = {Eleanora I. Robbins},
  year = {1991},
  doi = {10.3133/ofr91613},
  url = {https://pubs.usgs.gov/publication/ofr91613},
  note = {Source identifier: ofr91613}
}