@misc{indiciae32ebc296ab23,
  title = {Utility of palmatolepids and icriodontids in recognizing Upper Devonian Series, Stage, and possible substage boundaries},
  author = {W. Ziegler and Charles Sandberg},
  year = {2000},
  url = {https://pubs.usgs.gov/publication/70022164},
  note = {Source identifier: 70022164}
}