@misc{indiciaed261c1d73181,
  title = {Organic matter variations in transgressive and regressive shales},
  author = {M.A. Pasley and W.A. Gregory and G.F. Hart},
  year = {1991},
  doi = {10.1016/0146-6380(91)90114-y},
  url = {https://pubs.usgs.gov/publication/70014964},
  note = {Source identifier: 70014964}
}