Microfossils & Stromatolites

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Where were the oldest microfossils found?

Marble Bar, Western Australia (3.4–3.5 billion years old).

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What environment did they suggest?

Hydrothermal vent ecosystems.

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What are stromatolites?

Fossilised cyanobacteria colonies that trapped sediments, creating layered structures.

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Why are stromatolites important?

They produced oxygen, leading to an oxygenated atmosphere and ozone layer.