Scientists from the United States and Japan have discovered unusual spindle-shaped organic microfossils in 3 billion-year-old rocks from the Pilbara Craton of northwestern Australia. Spindle-like plankton microfossils found in the Farrel Quartzite, Pilbara Craton, northwestern Australia (Christopher House) The microfossils are from 20 to 60 microns in length, about the size of fine sand and within the size range of today’s microplankton. They...