In fact, there were lots of interesting marsupials around a million years ago, that are now extinct.
Later, we were shown lots of evidence of them. Here is an assortment of different kangaroo jaws.
Teeth from a giant wombat.
Even the front tooth from a palorchestes – a marsupial tapir – that we found on the ground.
Of course, the marsupials weren’t on their own. There were other interesting creatures around at the time too.