@misc{indiciaebc517dfcba28,
  title = {Upper campanian (upper cretaceous) ammonites from the Marshalltown Formation-Mount laurel boundary beds in Delaware},
  author = {W. J. Kennedy and W. A. Cobban},
  year = {2016},
  doi = {10.1017/s0022336000038968},
  url = {https://pubs.usgs.gov/publication/70020304},
  note = {Source identifier: 70020304}
}