@misc{indiciae25afacb09d4e,
  title = {The stratigraphic utility of the trace fossil Pteridichnites biseriatus in the Upper Devonian of eastern West Virginia and western Virginia, USA},
  author = {R.R. McDowell and K.L. Avary and D.L. Matchen and J.Q. Britton},
  year = {2007},
  url = {https://pubs.usgs.gov/publication/70031772},
  note = {Source identifier: 70031772}
}