I was lucky enough to interview one of the scientists who have a new take on Bunbury’s weird black rocks.
(c) WA Museum.
They were formed when India broke away from the West Australian coast 137 million years ago.
What we see in Bunbury and Capel is part of a huge lava flow almost as large as Western Australia itself that comes from Gondwana breaking up.
Most of it is now under the waters of the Indian Ocean.
As the website sciencewa.net.au is now defunct I have reproduced the story here: