Lopian orogeny explained

The Lopian orogeny (also known as the Rebolian orogeny) was a mountain building event that affected the Baltic Shield during the Archean, between 2.9 and 2.6 billion years ago. The Kola-Belomorian gneiss and Karelian granitoid-greenstone terrane both formed during this time.^{[1] [2]}

Notes and References

1. Gaal, G. & Gorbatschev, R. . 1987. An Outline of the precambrian evolution of the baltic shield. Precambrian Research. 35. 15–52. 10.1016/0301-9268(87)90044-1. 1987PreR...35...15G.
2. Book: Goodwin, A. . 1991. Precambrian Geology: The Dynamic Evolution of the Continental Crust. Academic Press. 582. 9781483288550.