Wikipedia contributors. (2024, February 15). Eridu. In Wikipedia, The Free Encyclopedia. Retrieved April 1, 2024, from https://en.wikipedia.org/w/index.php?title=Eridu&oldid=1207529232
Two of the largest known impact events on Earth occurred during the Orosirian. Early in the period, 2023 Mya, a large asteroid collision created the Vredefort impact structure. The event that created the Sudbury Basin structure occurred near the end of the period, 1850 Mya.