@misc{indiciae4a9e3db9b828,
  title = {Dark materials in Valles Marineris: Indications of the style of volcanism and magmatism on Mars},
  author = {Paul E. Geissler and Robert B. Singer and Baerbel K. Lucchitta},
  year = {2012},
  doi = {10.1029/jb095ib09p14399},
  url = {https://pubs.usgs.gov/publication/70200538},
  note = {Source identifier: 70200538}
}