@misc{indiciae06779300de0d,
  title = {Element distribution in some trough and platform types of black shale and associated rocks},
  author = {James David Vine and E.B. Tourtelot and J. R. Keith},
  year = {1969},
  doi = {10.3133/b1214h},
  url = {https://pubs.usgs.gov/publication/b1214H},
  note = {Source identifier: b1214H}
}