@misc{indiciae097c6b849cab,
  title = {Preliminary isopach and sand/shale ratio maps of the Cambrian Davis Formation, Rolla 1 degree by 2 degrees Quadrangle, Missouri},
  author = {J. L. Thacker and K. H. Anderson},
  year = {1979},
  doi = {10.3133/mf1002d},
  url = {https://pubs.usgs.gov/publication/mf1002D},
  note = {Source identifier: mf1002D}
}