Geologic Time Scale (Alpha)
This app has tons of info as well as a trivia quiz that will test your new found knowledge.
Geological Time Scale
It’s so intriguing to me that we can tell how old something is just by examining the color. This app shows what I’m talking about on a much more scientific level.
This app gives you all of the past geologic periods along with their scientific name and a link to a website with more info on it.