Category Archives: Archean

Lots of oxygen on the Archean Earth?

New evidence for the early evolution of photosynthesis: was the early Earth really as oxygen-free as we think it was?
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Categories: Archean, geochemistry, geology, paper reviews, past worlds, rocks & minerals

Geopuzzle #12 (finally) revisited

The answer? I dunno…
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Categories: Archean, geology, geopuzzling, past worlds

What’s up with those Archean sandstones?

In addition to searching out evidence for Archean microbial mats, my revisitation of the Pongola sandstones gave me the chance to look a bit more closely at their lithology. When I last posted pictures from this sequence, there was a … Continue reading

Categories: Archean, fieldwork, geology, geopuzzling, past worlds

Archean bacterial mats under the hammer

Geovandalism rears it’s ugly head once more.
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Categories: Archean, fieldwork, fossils, geology, paper reviews, past worlds, ranting

Sadly, not sandworms

The answer to Friday’s geopuzzler
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Categories: Archean, fossils, geology, past worlds, Proterozoic