 periods of world history did you have to do that i remember having that memorized at one point and uh that'd be another one of those that i would look back on and think was that just an episode an experiment in memorization or was i supposed to hang on to that for the rest of my life when the pleocene era ended in the jurassic era began and how long i was just gonna say i'm unplaced to see man any other era is a waste of time i don't even want to look at your bones if you're from a different era