Ordovican —> Silurian —> Devonian —> Carboniferous
My love for this kind of images comes from my love for tapestries. I could look at them all day and imagine how Earth used to look back then. It always makes me feel this painful tugging in my chest – because I know I will never see it.
Those are 4 of 6 periods of the Paleozoic Era :).
The images are not mine.