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The City of Karratha, was up until 1st July 2014, formerly known as the Since reaching the 20,000 population mark, the City of Karratha became the new name for the Shire of Roebourne.
It encompasses the towns of Roebourne, Wickham, Pt Samson, and Cossack and the port of Dampier.
Such and similar sedimentary structures are of biological origin.
They document ancient microorganisms that formed carpet-like microbial mats on the former sediment surface.
To see how Aboriginal engravings fit into the evolution of cave art in Europe and elsewhere, see: Prehistoric Art Timeline (2.5 million BCE onwards).Professor Wacey said identifying and reconstructing Earth's earliest biosphere was challenging because the oldest sedimentary rocks were not only rare, but also almost always changed by hydrothermal and tectonic activity."The Pilbara region of Western Australia is one of the rare geological regions that provides insight into the early evolution of life on Earth," he said.The prehistoric rock engravings of Murujuga feature a wide variety of subjects and motifs, including depictions of extinct megafauna such as the Tasmanian tiger (thylacine), and human figures in everyday as well as ceremonial activities.The area also contains a range of aboriginal megalithic art, involving standing stones like the European megaliths (menhirs), as well as circular stone arrangements.
"A common example would be the binding together of sediment grains by microbes to prevent their erosion by water currents," he said.