greysonia sp. stromatolites, vendian period 650 million years old, pre-cambrian

650 abstract ago america among ancient are background beautiful biology bolivia cerro colonies dates design earth earths education first form formation fossil geology greysonia history huanaquinn life million miraflores molino mounds museum natural nature old oldest organic organisms origin paleontology pattern period photosynthesis precambrian quality rock science scientific sediments slab south stone stromatolite stromatolites structures this vendian water years