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The archean age, during which the brooding seems to have gone on, was probably as long as all the ages since.
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The period following on after Archean time is called, by geologists, Paleozoic time.
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Others divide the Precambrian into two eras, the very ancient Archean and the more recent Proterozoic.
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Archean rocks form the cores of the ancient crystalline masses within the littoral zone from Algiers to Bona.
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Rocks of Archean age cover wide areas in the interior, in West and East Africa and across the Sahara.
Usage of archaean in English
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No known archaean seemed to be equipped to be a host cell.
2
But it was an archaean that had some surprising similarities to eukaryotes.
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However, by 2010 it was pretty clear that the host cell was an archaean.
4
This implies that an archaean somehow picked up the lipid modification enzymes from bacteria.
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When Loki was found in 2015, it was immediately apparent that it was an archaean.
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Eventually, the archaean formed more and more of these protrusions until they completely enveloped the bacterium.
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DNA replicates only with the assistance of a huge range of other molecules, whose complicated activity is coordinated by a cell, bacterium, or archaean.
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Many chromosomal mechanisms are performed by proteins whose genes can be traced right back to the archaean organism that accommodated the original free-living oxygen-using mitochondria.
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If an archaean were to suddenly pick up so many new genes, its cellular processes would have been disrupted and it would probably have died.
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It is hard to see how this could have worked: if the archaean was eating a piece of food, why would it not digest it?
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Directly or indirectly, the fish is a descendant of some Archaean Annelid.
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The Archaean rocks still solidly underlie the lowest depth he has ever reached.
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Even in the Archaean age something in the form of life may have appeared.
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Bacteria and archaeans were the major lifeforms for two and a half billion years.
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In Canada, more than anywhere else in the world, is this Archaean formation seen.
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The Yule River Project is considered prospective for Archaean mesothermal lode style gold deposits.