Fossil dating techniques

20-Jun-2017 10:39

Today, stromatolites are nearly extinct in marine environments, living a precarious existence in only a few localities worldwide.Modern stromatolites were first discovered in Shark Bay, Australia in 1956, and throughout western Australia in both marine and non-marine environments.In some cases, they can form inorganically, for example when seawaters are oversaturated with certains chemicals resulting in precipitation.

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Cyanobacteria’s metabolic byproduct, oxygen, rusted the earth, pumped enormous oxygen poison to them into earth’s atmosphere, and in so doing paved the way for aerobic-based life to emerge and diversify; cyanobacteria’s contributions to life led to their own prodigious decline.

Microbial communities diversified through time, with eukaryotic organisms eventually joining the mix.

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Smaller tumuli were used as the burial mounds, while bigger (some up to 7 metres high with 60 metres long base) were the cenotaphs (empty tombs) and ritual places.… continue reading »

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