The Carboniferous is a geologic period of Earth's history spanning 60 million years from the end of the Devonian Period 358.9 million years ago (Mya), to the beginning of the Permian Period, 298.9 Mya. It was the penultimate period of the Paleozoic era.
In the real world
- In this era, trees and other giant plants successfully colonized the land, and many different species of giant insects evolved, including the ancestors and relatives to many modern insects. The giant dragonfly-like Meganeura (the real-life inspiration for Toho's Meganulon, Meganula and Megaguirus) arise and become extinct at the very end of the Carboniferous, 305-299 Mya.
- The Meganulon (Meganulon hory) and Meganula (Meganula luisae) are among the strongest creatures alive. An egg containing large numbers of Meganulons, including their Queen, is suddenly pulled through to 2000 as a result of the Dimension Tide's first test. (Godzilla vs. Megaguirus)
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