that’s bound to be one of many more...you may have a treasure-trove buried on your farm.
Images from Petrified Forest National Park:
http://www.terragalleria.com/parks/np.petrified-forest.all.html
Thanks for the link; I remember going to the "petrified forest" in SD as a kid. Our area was apparently once covered by glaciers; then was a marshy area; until it was drained and became farmland.
As for the "treasure-trove"...we are in a very rare drought...we may have to start "farming" for petrified wood; as the corn crop is looking particularly hideous.