@misc{indiciae9f1560915302,
  title = {40Ar/39Ar age of the Manson impact structure, Iowa, and correlative impact ejecta in the Crow Creek member of the Pierre Shale (Upper Cretaceous), South Dakota and Nebraska},
  author = {G. A. Izett and W. A. Cobban and G. B. Dalrymple and J. D. Obradovich},
  year = {1998},
  doi = {10.1130/0016-7606(1998)110<0361:aaaotm>2.3.co;2},
  url = {https://pubs.usgs.gov/publication/70021039},
  note = {Source identifier: 70021039}
}