@misc{indiciae414bd8725125,
  title = {A dynamic marine calcium cycle during the past 28 million years},
  author = {E.M. Griffith and A. Paytan and K. Caldeira and T.D. Bullen and E. Thomas},
  year = {2008},
  doi = {10.1126/science.1163614},
  url = {https://pubs.usgs.gov/publication/70032848},
  note = {Source identifier: 70032848}
}