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3.5 to 3.2 billion years old. The geology was reassessed in 2007 with the separation out from the geologically named Pilbara Craton of a thick succession of interbedded clastic or chemical sedimentary rocks and volcanic rocks forming the Fortescue, Hamersley, and Turee Creek basins that are usually aged from 2.78-2.42 billion years old and the younger volcano-sedimentary Ashburton Basin aged from 2.21-1.79 billion years ago. A surface region between the Fortescue and Hamersley basins is even younger, at less than 1.7 billion years old, as are

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