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Telltale Rocks
Rana, FR. 2002.  Facts for Faith (8):9. CELD ID 5871

Research conducted by scientists from Denmark and Australia has uncovered new evidence for the metabolic complexity of early life on Earth. This team studying 3.5 billion-year-old rocks from northwestern Australia recovered sulfide deposits that represent the activity of ancient sulfate-reducing microorganisms. The sulfide deposits' association with organic carbon residue further supports their biological origin, meaning that complex sulfate-reducing pathways existed. In the words of the researchers, "Sulphate reduction is a complex metabolic process requiring advanced membrane-bound transport enzymes, proton motive force generation by ATPase and other charge separation proteins, and the genetic regulation of protein synthesis through DNA and RNA."