He found a particularly large "rock"; had to go get the loader to dig it out...it was a very LARGE 4-ft long, 2+ ft. dia. part of a petrified tree trunk. He moved it to a safe place for storage..not sure if I should sell it or put it in the garden.
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