Outside, we saw the cave where Mitchell and Rankin found the first diprotodon bones.

But as more bones were discovered, they found bones of creatues that were distinctly reptilian.

There were fossils from a giant lizard, which they named megalania. They were much bigger than present day Komodo dragons, at almost 5 metres in length. We saw a full-size replica in the bush.

But more interesting I think were the Wonambi – giant snakes. Here is a replica at the bottom of a sink hole.

These snakes were estimated at 10 to 11 metres long. We saw some vertebrae that had been collected.

Three vertabrae just fitted into a drawer, and if you think of how a human back bone looks in comparison to its size, then it’s obvious that this snake was very big.

Perhaps this was what the early Aboriginals saw when they first came to Australia? Perhaps this was their Rainbow Serpent?

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.

The diprotodon might have been big, but by most accounts it was a gentle giant. There were however carnivore marsupials around at the time too, and ones that were bigger than the Devils. The most ferocious was a species called thylacoleo – the marsupial lion.

We saw a replica of a full skeleton, and there were bits and pieces also on display. The animal is likened more to a leopard than a lion, in that it was of similar size, had a powerful jaw and teeth like sheers, and long retractable claws to slash its prey, and scarily, climb trees. It would be the most ferocious drop bear you’d ever see. They were so effective in their hunting that they would prey on the hapless diprotodon and other large herbivores.

Glad this guy isn’t around anymore!

Back on the surface, we were shown a few diprotodon fossils, which showed how big this marsupial was.

Its molar. Compare it with a human molar and you quickly get the picture.

Its thigh bone.

And a close up of a replica skull.

No wonder it was the biggest marsupial that ever lived!

Phosphate wasn’t the only thing the miners found.

The deeper they went, the more fossils they found.

At one place, there was a wall full of bones and teeth.

Over the years, paleontologists have been digging up and studying the fossils found in the mine. Some even ended up in Germany.

But how had the animals got there?

Scientists think it might be one of two ways. Remember the bats, the ones who produced all the poo? These bones might be the remnants of their kills. That’s why there were a lot of small animals there – rodents, snakes, bandicoots, and other small marsupials. The second way was that they fell into the caves through sink holes and couldn’t get back out.

The first explanation covers the shards on the walls. The second covers the bigger things they found. We’ll see what they were next.