Metatheria
Distribution:
• Miocene of Argentina (1 collection)
• Eocene of Antarctica (1), China (1), United States (1: Wyoming)
• Paleocene of Argentina (1), United States (1: North Dakota)
• Cretaceous of Canada (23: Alberta), United States (11: Montana, New Mexico, South Dakota, Utah, Wyoming)
Total: 40 collections each including a single occurrence