@misc{indiciae5373f7fe1da0,
  title = {Late Ordovician (Turinian-Chatfieldian) carbon isotope excursions and their stratigraphic and paleoceanographic significance},
  author = {Greg A. Ludvigson and B.J. Witzke and Luis A. Gonzalez and S.J. Carpenter and C.L. Schneider and F. Hasiuk},
  year = {2004},
  doi = {10.1016/j.palaeo.2004.02.043},
  url = {https://pubs.usgs.gov/publication/70026752},
  note = {Source identifier: 70026752}
}