@misc{indiciae08d5bf3beb34,
  title = {Altitude of the top of the Sparta Sand and Memphis Sand in three areas of Arkansas},
  author = {Aaron L. Pugh and Paul W. Westerfield and Gerard Gonthier and David T. Poynter},
  year = {1998},
  doi = {10.3133/wri984002},
  url = {https://pubs.usgs.gov/publication/wri984002},
  note = {Source identifier: wri984002}
}