This is what 510,000,000 year old rock looks like. It is Metamorphic rock that was once part of a pre-historic ocean, pushed back underground as the continents moved around and cooked for millions of more years and then, only recently (maybe 50-80 Mya) pushed back up to the surface as the continents continued to move around. During this period animal life evolved. Bloody amazing. This rock predates all multicellular life on the whole, entire planet (deliberate Americanism there).