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Still Waters

Fossil raindrops probe ancient atmosphere

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The imprints of raindrops preserved in 2.7bn-year-old rock are being used to figure out what the atmosphere was like on the early Earth.

Scientists have used the depressions drops left to calculate how fast they were going as they impacted the ground.

This has allowed them to determine the density of air in ancient times.

http://www.bbc.co.uk...onment-20575250

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I'll be a bit dubious of any measurements or predictions they make off the imprint size on a 2.7 billion year old rock. All kinds of stuff can happen to it in that time.

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