U.S. Geological Survey Geologic Time Spiral.
The U.S. Geological Survey offers a treasure-trove of interesting and educational posters, maps, books, and images. Some are for sale in the USGS store and others are “fair use.”
This incredible artist’s rendering (designed by Joseph Graham, William Newman, and John Stacy) can be viewed in more detail on the USGS website and downloaded as a (U.S.) paper-sized or poster-sized PDF.
