I am not sure if this Geological Time Graphic by the
USGS General Interest Publication Series has been circulated before in the geoblogosphere.
A reader sent me the link a couple of days ago.
![](//2.bp.blogspot.com/_saMrqhd2slo/SltTleBHWVI/AAAAAAAAAxw/eQ2QZQR3FkE/s400/spiral.jpg)
Poster size versions of the diagram are available for download.
Thanks, I hadn't seen this before.
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