@misc{indiciae437d546d7437,
  title = {Geochemical evidence for Paleozoic oil in Lower Cretaceous O Sandstone, northern Denver basin},
  author = {J.L. Clayton},
  year = {1989},
  doi = {10.1306/44b4a2c6-170a-11d7-8645000102c1865d},
  url = {https://pubs.usgs.gov/publication/70016032},
  note = {Source identifier: 70016032}
}