@misc{indiciaec1ab9fd004a9,
  title = {Photoglossary of Marine and Continental Ichnofossils},
  author = {Stephen T. Hasiotis and Thomas M. Bown and C. C. Abston},
  year = {1994},
  doi = {10.3133/ds23},
  url = {https://pubs.usgs.gov/publication/ds23},
  note = {Source identifier: ds23}
}