Orosirian

Rarity: Uncommon

A topic a little better known than average, read and translated beyond its own country.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

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What Wikipedia says

The Orosirian ( ; Ancient Greek: ὀροσειρά, romanized: oroseirá, meaning "mountain range") is the third geologic period in the Paleoproterozoic Era. It spans 250 million years and lasted from 2050 to 1800 million years ago (Ma), following the Rhyacian Period and preceding the Statherian Period.

Excerpt from the Wikipedia article “Orosirian”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Ventus55, CC BY-SA 3.0, via Wikimedia Commons.