@misc{indiciae79fcbcd71953,
  title = {Stratigraphy of the upper Cambrian, Llano Uplift, Texas},
  author = {Josiah Bridge and V.E. Barnes and P. E. Cloud},
  year = {1947},
  doi = {10.1130/0016-7606(1947)58[109:sotucl]2.0.co;2},
  url = {https://pubs.usgs.gov/publication/70214506},
  note = {Source identifier: 70214506}
}