Mesozoic era - Era considered age of reptiles, dinosaurs and mammals. , Period - Third biggest measurement in time scale., Eons - The biggest "chunk" of earth time., Era - What eons are divided into., Cenozoic era - Era we are currently a part of., Proterozoic eon - First time solid landmasses formed., Bacteria - Some of the first organisms to exist., ~11% - The percent of earth's history thoroughly recorded in rocks., ~89% - The percent of earth's history that we have little information about., Jurassic period - When Pangea started to break up.,

geologic time

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