First Mesozoic mammal from Australia—an early Cretaceous monotreme

@article{Archer1985FirstMM,
  title={First Mesozoic mammal from Australia—an early Cretaceous monotreme},
  author={Michael Archer and Tim Fridtjof Flannery and Alexander Ritchie and Ralph E. Molnar},
  journal={Nature},
  year={1985},
  volume={318},
  pages={363-366}
}
Here we describe Australia's first known Mesozoic mammal and the first known early Cretaceous mammal from Gondwanaland. Steropodon galmani n. gen. and sp., discovered in early Cretaceous sediments at Lightning Ridge, New South Wales, Australia, appears to represent an ornithorhynchid-like monotreme. This discovery represents the first record of a fossil mammal from Australia that is older than 22.4±0.05 Myr1,2 and the specimen is, by more than 85Myr, the oldest known monotreme. As the oldest… 
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