@misc{indiciae136503a07428,
  title = {Nature and origin of early and late cherts in the Leadville Limestone, Colorado},
  author = {Norman G. Banks},
  year = {1970},
  doi = {10.1130/0016-7606(1970)81[3033:naooea]2.0.co;2},
  url = {https://pubs.usgs.gov/publication/70226766},
  note = {Source identifier: 70226766}
}