This image shows the typical terrain and depositions of logs that make up the Petrified Forest National Park in Arizona.
Reproduction from a Mike Roberts Kodachrome by Intermountain Tourist Supply, Phoenix, Ariz.
The description states:
C649–PETRIFIED FOREST, ARIZONA
Logs of rock are a never-ending source of interest to visitors in the Petrified Forest National Monument, located near U.S. Highway 66 in eastern Arizona.
–For a long period of time travelers would stop along their way and collect samples large and small of the fossilized wood. Once the area was protected as a national monument (and later park) such collecting was prohibited, and samples are gathered from nearby areas instead.
This card likely dates from the 1950s.