@misc{indiciaeca7715463ca0,
  title = {Chemical changes and carbon isotope variations in a cross-section of a large Miocene gymnospermous log},
  author = {A. L. Bates and E.C. Spiker},
  year = {1992},
  doi = {10.1016/0009-2541(92)90006-q},
  url = {https://pubs.usgs.gov/publication/70016980},
  note = {Source identifier: 70016980}
}