Saamian orogeny
From Infogalactic: the planetary knowledge core
The Saamian orogeny is one of the earliest recognizable events in the formation of the Baltic Shield, between 3.1 and 2.9 billion years ago in the Archean and Proterozoic. [1] The Saamian orogeny is associated with intense plutonic activity that intruded massive granitoid deposits. The event lined up with the Katarchean, a period in which the Earth's crust approached its present thickness and sialic rocks, rich in silica and aluminum, became commonplace. [2]
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