Earth lovers, you probably know this great science app. I am a bit slower, I just ran across it! The Howard Hughes Medical Institute has an app in the online Apple store showing the geological periods, along with where the continents were during each of them. It also indicates the percentages of oxygen and carbon dioxide in the atmosphere at that time as well. The app is called Earth Viewer and is available for FREE here.
Additional graphs show the Earth’s temperature and CO2 levels from the beginning of the Cambrian to the present (Anthropocene).