@misc{indiciaea3e44e936df5,
  title = {The Foerstia zone of the Ohio and Chattanooga Shales},
  author = {James Morton Schopf and J.F. Schwietering},
  year = {1970},
  doi = {10.3133/b1294h},
  url = {https://pubs.usgs.gov/publication/b1294H},
  note = {Source identifier: b1294H}
}