@misc{indiciaeb638280d31f2,
  title = {Problems of Pleistocene Stratigraphy},
  author = {L.L. Ray},
  year = {1949},
  doi = {10.1130/0016-7606(1949)60[1463:pops]2.0.co;2},
  url = {https://pubs.usgs.gov/publication/70206701},
  note = {Source identifier: 70206701}
}