@misc{indiciae0c9cf0dc656a,
  title = {Nature and regional significance of unconformities associated with the Middle Ordovician Hagan K-bentonite complex in the North American midcontinent},
  author = {Dennis R. Kolata and W.D. Huff and Stig M. Bergstrom},
  year = {1998},
  doi = {10.1130/0016-7606(1998)110<0723:narsou>2.3.co;2},
  url = {https://pubs.usgs.gov/publication/70020784},
  note = {Source identifier: 70020784}
}