by Ciro Santilli (@cirosantilli, 37)
As usual, blame the Russians.
The term "visible life" refers to multicellular from before people knew there was life in the proterozoic.
This period is similar to the Quaternary, but it also includes tool usage by close relatives of humans which were not humans yet.
It ends together with the pleistocene.
Agriculture is not the official definition of the age. But it is good enough. Likely related to the official end of glaciations thing.
No life, earth too hot, until formation of water.

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Made up mostly of calcium carbonate.
"Joachimsthal" is the German for it. Note how it is just near the modern frontier between Germany and the Czech Republic.
It is from ore of this mine that Uranium and Radium were discovered.
Apparently the region was a silver mining center:
Starting in the late Middle Ages, pitchblende was extracted from the Habsburg silver mines in Joachimsthal, Bohemia (now Jáchymov in the Czech Republic), and was used as a coloring agent in the local glassmaking industry
A hugely important copper mine in Sweden.
Selenium was initially discovered from ore from this mine.
Figure 1. Source.
Figure 2. Source.
Video 1.
Mining Area of the Great Copper Mountain in Falun, Sweden by World Heritage Journeys
. Source.
Video 2.
Falun mine tour by Focus by Sohaib
. Source. Not English, but we can see the tour images at least.

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