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A summary of geologic time. The chart can be read from top left to bottom right, spanning the present to 4.6 billion years ago. We presently exist in the Holocene, which is the tiny rectangle that I have marked in orange found at the top left. Many scientists are beginning to argue (and agree) that we new exist in a new era of our own making, the Anthropocene. This era would reside on top of the Holocene. See Day 143: A new Era: the Anthropocene for more details.