@misc{indiciae658cf966e6da,
  title = {Borehole petrophysical chemostratigraphy of Pennsylvanian black shales in the Kansas subsurface},
  author = {J.H. Doveton and D. F. Merriam},
  year = {2004},
  doi = {10.1016/j.chemgeo.2003.12.027},
  url = {https://pubs.usgs.gov/publication/70026586},
  note = {Source identifier: 70026586}
}