"Prebiotic Synthesis of 5-Substituted Uracils: A Bridge Between the RNA World and the DNA-Protein World," p 702-705 v 226, , 5 May 1995.
Rose, George D.
By 3.6 to 3.8 billion years ago all of these events had come to pass; the RNA world had fallen and the DNA/protein world had risen in its place.But other researchers see evidence for prokaryotic cells in the first 100 million years, maybe even immediately.
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For example, Manfred Eigen of Germany's Max Planck Institute says, "There is no doubt that proteins, which are more easily formed, were first on the scene" .