@misc{indiciae2430cf2ba5ec,
  title = {Differentiation of volcanic ash-fall and water-borne detrital layers in the Eocene Senakin coal bed, Tanjung Formation, Indonesia},
  author = {Leslie F. Ruppert and T.A. Moore},
  year = {1993},
  doi = {10.1016/0146-6380(93)90041-9},
  url = {https://pubs.usgs.gov/publication/70018391},
  note = {Source identifier: 70018391}
}