@misc{indiciae35761039ad2e,
  title = {Age of the Denbigh flint complex},
  author = {David M. Hopkins},
  year = {1952},
  doi = {10.1126/science.116.3019.513-a},
  url = {https://pubs.usgs.gov/publication/70221607},
  note = {Source identifier: 70221607}
}