Timeline

Terminology Notes: As there are a few dates well back into prehistory, some less commonly known notations are used. "Ma" stands for "megaannus" (or "megannus") and is a unit of time equal to one million years. Similarly, "ka" (kiloannus/kilannus) is a unit of time equal to one thousand years. Thus "15 Ma" should be read as "15 million years ago". Ga is "gigaannus", or one billion years ago.

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