@misc{indiciaec1a1308d1fe8,
  title = {On microbial contaminants, micropseudofossils, and the oldest records of life},
  author = {P. Cloud and K. Morrison},
  year = {1979},
  doi = {10.1016/0301-9268(79)90052-4},
  url = {https://pubs.usgs.gov/publication/70012486},
  note = {Source identifier: 70012486}
}