@misc{indiciae7907f3e2876d,
  title = {Chemical composition, stratigraphy, and depositional environments of the Black River Group (Middle Ordovician), southwestern Ohio.},
  author = {David A. Stith},
  year = {1981},
  doi = {10.1130/0016-7606(1981)92<629:ccsade>2.0.co;2},
  url = {https://pubs.usgs.gov/publication/70011948},
  note = {Source identifier: 70011948}
}