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" ... That’s sedimentary rock: the kind that contains fossils. But place too many layers of rock atop your fossils for too long, and that combination of pressure and time will cause changes in that rock, and result in a metamorphosing of its contents. Rock that begins to metamorphose can still contain fossils so long as it’s only partially metamorphosed. But completely metamorphosed rock no longer has any. So if you asked a scientist who studied Earth’s natural history some 40 years ago how old life on Earth was, they would’ve told you at least one-to-two billion years and probably more, but they couldn’t prove it. ... "