Silurian-Devonian Terrestrial Revolution
The Silurian-Devonian Terrestrial Revolution (SDTR), also known as the Devonian Plant Explosion (DePE) and the Devonian explosion, was a period of rapid colonization, diversification and radiation of land plants (particularly vascular plants) and fungi (especially dikaryans) on dry lands that occurred 428 to 359 million years ago (Mya) during the Silurian and Devonian periods, with the most critical phase occurring during the Late Silurian and Early Devonian. This diversification of terrestrial photosynthetic florae had vast impacts on the biotic composition of the Earth's surface, especially upon the Earth's atmosphere by oxygenation and carbon fixation.
Source: Wikipedia — Silurian-Devonian Terrestrial Revolution (CC BY-SA 4.0)