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Product Description
Arizona Petrified Wood Araucarioxylon Polished Round Rock
This is a polished Arizona Petrified Wood complete round that is 4.7 inches by 3.4 inches wide and .62 inch thick.
It is slabbed and polished on one side-natural "break on the back".
The most important find in the world of Petrified Wood is in Northern Arizona. The majority of the petrified wood here is Araucarioxylon arizonicum, or Araucaria, a prehistoric type of conifer.
This Petrified Wood is found in the Chinle Formation and comes from the Triassic Period around 220 million years ago.
The "Petrified Forest" was made a National Park in 1962. In 1988 the Arizona state legislature designated petrified wood the Arizona state fossil.
Petrified Wood formed when a tree died and is 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.
