US Dollar
Australian Dollar
Euro
CAD
Product Description
Petrified Wood Round Unpolished Stone Slab Grassy Mountain Oregon
This round ("bark" all the way around) Petrified Wood unpolished stone slab is 4.3 inches by 3 inches and 4 mm thick.
It weighs .16 lbs. and is shown wet in the first 3 pictures.
This came from an old collection that was self-collected sometime from the 40's to the 70's.
Grassy Mountain is a remote high desert rockhounding destination in Malheur County, near Owyhee Lake, Oregon and is well-known for the excellent quality of petrified wood.
The Grassy Mountain Formation of southeastern Oregon is from the Middle-Miocene age about 12.5 million years ago.
The conifer wood, which typically has well-preserved cellular structures, appears in shades of gorgeous yellow as well as beige, brown, orange, gray, and black.
Petrified Wood formed when a tree died and was quickly buried by sediments. Minerals in the groundwater then permeated the wood, replacing the original organic matter and turning it to stone. The main mineral is silica, but trace elements in the silica create a variety of colors.
For over a century, fossilized remains of stumps, logs, and branches have been recovered from several localities near Grassy Mountain.
