This is not a profound post. This is more of an internal memo among bloggers.
I needed a time scale for something, so I went to the USGS and ripped two different ones. These are modified so that they are 500 pixels wide and have space on the right to slap in symbols or text (if you have the right software). They are jpeg files and moderately compressed. There is lots more room for compression.
Since they are US government products they are free of copyright. I provide them here for others to use and provide links to the sources in case you want to get an earlier version of the file (or learn about California Geology or Death Valley).
If you think these are not good enough, do not tell me. Rather, make a better one and email it to me (with any appropriate link backs) and as long as it is clearly copyright-free (in the sense that it can be freely used) I’ll post it!