Assertion: marsupial's ancestor | /r/CapableOf | date to the oligocene-miocene boundary
Facets:
value: approximately
type: TEMPORAL
Source sentences:
text: However, this is inaccurate, the oldest opossum fossils are early Miocene in age (roughly 20 million years old) and the last common ancestor of all living opossums approximately dates to the Oligocene-Miocene boundary (roughly 23 million years ago) and is at most no older than Oligocene in age.