Monday, March 6, 2017

the history of biological life on earth

Geological time spiral.png
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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