Earlier this year, Walker was exploring at low tide and found ancient rock etchings that depict kangaroo footprints in the intertidal zone of the Pilbara"s Burrup Peninsula. He believes this is the first such underwater find of its kind anywhere in Australia, garnering significant scientific interest. He explained that the current theory of origin is that this etching was likely made after the last ice age when the water levels were more than 100m lower, between 7,000 and 18,000 years ago.

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