By United States Geological Survey - Graham, Joseph, Newman, William, and Stacy, John, 2008, The geologic time spiral—A path to the past (ver. 1.1): U.S. Geological Survey General Information Product 58, poster, 1 sheet. Available online at http://pubs.usgs.gov/gip/2008/58/, Public Domain, Link
*I am adding one branch, a pink start.*
Of course every link is a branch. There is also, on the page where I got this image, another exquisite version, including innumerable links.
This is a note of appreciation to Wikipedia and The USGS ... who give me, and us, so much. *
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