Category Archives: Proterozoic

Sadly, not sandworms

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

How the air we breathe became breathable

What geology tells us about the evolution of the Earth’s atmosphere.
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Categories: Archean, geochemistry, geology, paper reviews, past worlds, Proterozoic

Bacteria and black smokers go back a long way

I tempered the other week’s repost on some rather impressive 1.5 billion year-old black smoker chimneys, and the fossilised microbes found within them, with some words of caution about the ‘clues to the origin of life’ spin that the discovery … Continue reading

Categories: fossils, geology, paper reviews, Proterozoic

Namibia: the stromatolites’ last hurrah

Some of the more massive limestone beds in the Nama group are chock full of stromatolites, the remnants of sizeable Precambrian algal reefs. Technically, stromatolites are not true fossils, because the mineralised layers are not directly precipitated by the photosynthetic … Continue reading

Categories: fieldwork, fossils, geology, outcrops, past worlds, photos, Proterozoic

Namibia: Precambrian fossils

The base of the Cambrian is traditionally thought of as the point at which large, mineralised body fossils first appear in the geological record, giving us a much-improved record of the development of life up to the present day. However, … Continue reading

Categories: fieldwork, fossils, geology, outcrops, past worlds, photos, Proterozoic