@misc{indiciae21d221703772,
  title = {Silicified wood from the Permian and Triassic of Antarctica: Tree rings from polar paleolatitudes},
  author = {P.E. Ryberg and E.L. Taylor},
  year = {2007},
  doi = {10.3133/ofr20071047srp080},
  url = {https://pubs.usgs.gov/publication/ofr20071047SRP080},
  note = {Source identifier: ofr20071047SRP080}
}