Paleontological postcard

Archeology is quite particular theme to collect. I notice that it's not clear to everyone what archeology is. I've received for example a paleontological postcard under the name of archeology. But who cares, it's interesting as well!

This postcard was sent to me from Australia. In the picture there's a skull of the largest known marsupial that roamed in Australia. I wonder how large it was? It may have become extinct as recently as 20,000 years ago. The skull was found in Tambar Springs, near Coonabarabran, N.S.W., Australia.