Meteorite bombardment likely to have created the Earth's oldest rocks


Scientists have found that 4.02-billion-year-old silica-rich felsic rocks from the Acasta River, Canada – the oldest rock formation known on Earth – probably formed at high temperatures and at a surprisingly shallow depth of the planet’s nascent crust. The high temperatures needed to melt the shallow crust were likely caused by a meteorite bombardment around half a billion years after the planet formed.

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(S. Joshua Swamidass) #2

I find the use of the word “create” here to be both appropriate and and a counter-point.

(Ashwin S) #3

I read earlier about 4.2 Billion year old fossils of bacteria found in canada… Is this the same area?