@misc{indiciae7ba843c2bfc0,
  title = {Fossils in Ordovician tuffs, northeastern Maine, with a section on Trilobita},
  author = {R. B. Neuman and H. B. Whittington},
  year = {1964},
  doi = {10.3133/b1181e},
  url = {https://pubs.usgs.gov/publication/b1181E},
  note = {Source identifier: b1181E}
}