Home > Diorama > Timeline > Diorama Timeline It's hard to imagine that in a matter of moments, we cover 5 geologic periods and 300 million years of Earth's history. With our interactive Diorama Timeline, you can get a better look at just how that amazing history unfolds, and revisit some of your favorite scenes. You can then jump to the Dinosaur Timeline for a closer look at each period. Related Pages Diorama Storyline Read a detailed description of how the Diorama's 300 million years of history unfold. Dinosaur Timeline Now that you've seen how the Diorama's timeline unfolds, learn more about the five time periods and dinosaurs who lived in them.