@misc{indiciae5785b4440c2a,
  title = {Devonian conodont biochronology in geologic time calibration},
  author = {Charles Sandberg and W. Ziegler},
  year = {1996},
  doi = {10.1007/bf03042852},
  url = {https://pubs.usgs.gov/publication/70018075},
  note = {Source identifier: 70018075}
}