Observation: Marsupials are the dominant form of mammalian life in Australia, but relatively rare elsewhere in the world.
Hypothesis: Marsupials became isolated on Australia from other forms of mammalian life when the land masses drifted apart.
Prediction: Fossilized marsupials will be found on Antarctica.
The logical structure of this prediction and its confirmation is as follows:
If marsupials became isolated on Australia from other forms of mammalian life when the land masses drifted apart, then fossilized marsupials will be found on Antarctica.
Fossilized marsupials have been found on Antarctica.
First, I don't know if it's typos or not but you seem to be interchanging Australia and Antarctica.
More importantly, you've completely left of a much more important part of science.
Science is not founded solely on predictions, it's founded on the ability to disprove falsehoods.
So, your above statement should read more like this:
Hypothesis: Marsupials became isolated on Australia when it seperated.
Prediction: Marsupial fossils will be found in Australia.
Disprovable: Marsupial fossils should not be found elsewhere.
Evidence: Marsupial fossils _are_ found in Australia. Marsupial fossils have not been found elsewhere.
If Marsupial fossils are found elsewhere, we then need to review both the hypothesis and it's predictions.
Without testability, you aren't describing science.