The Geologic Clock (1920)

JF Ptak Science Books   Quick Post

Here's another found bit whilst looking for an article in the 1920 Scientific American by Robert Goddard--no Goddard though I did find this fine "geologic clock" in the January 10 issue for that year.  As you can see if you look a little closely, the Quaternary is about the last 10 minutes of the 24-hour clock of existence on Earth, with the last 6000 years occupying the last 12 seconds.  In any event,it is an artistic and informative representation of data, created nearly 100 years ago.  (It would be interesting to know when the first graphical representation of geologic time as a clock face appeared--offhand, I do not have that answer.)