Scientists uncovered a whole ecosystem!
Image: © Alex Boermsa
At that time, the Australian continent was mostly covered in rainforest. It had separated from Antarctica and South America, and was drifting further north. McGrath’s Flat was a billabong surrounded by rainforest.
What’s more, the microfossils reveal signs of how the Australian continent was changing. The rainforest was drying out and turning into the dry scrub, grassland and deserts that cover most of Australia today.
Detectives at work
It’s taken a lot of detective work from a team of Australian and international scientists to really dig into all these fossils. Their work has opened a window on the environmental change that Australia went through 15 million years ago.
One of the team leaders, Associate Professor Michael Frese from the University of Canberra, used an advanced microscope to look at and photograph the fossils. This helped the team identify the different types of fossilised pollen. As well as rainforest trees, there was also pollen from banksias that would have grown in drier conditions on the fringe of the rainforest.
Also through the microscope, the team could spot pigment (colouring) cells in incredibly well-preserved fossils, including a bird’s feather and a fish’s eye and skin!
Depth of detail