@misc{indiciae3f8bbf4e837e,
  title = {Recognizing the Albian-Cenomanian (OAE1d) sequence boundary using plant carbon isotopes: Dakota Formation, Western Interior Basin, USA},
  author = {D.R. Grocke and Greg A. Ludvigson and B.L. Witzke and S.A. Robinson and R. M. Joeckel and David F. Ufnar and R.L. Ravn},
  year = {2006},
  doi = {10.1130/g21998.1},
  url = {https://pubs.usgs.gov/publication/70030655},
  note = {Source identifier: 70030655}
}