@article{landing2021,
  title = {Precise Early {{Cambrian U}}\textendash{{Pb}} Zircon Dates Bracket the Oldest Trilobites and Archaeocyaths in {{Moroccan West Gondwana}}},
  author = {Landing, Ed and Schmitz, Mark D. and Geyer, Gerd and Trayler, Robin B. and Bowring, Samuel A.},
  year = {2021},
  journal = {Geological Magazine},
  volume = {158(2)},
  number = {2},
  pages = {219--238},
  issn = {0016-7568}
}