Dating petrified wood
Of course the biggest rock, mineral and fossil show is the one in Tucson, Arizona every January/February. And be sure to check out my "Localities" link above for a list of states and countries and the rocks and minerals found there!Unfortunately buying fossils is a “buyer beware” activity.
There are several ways for fossils to form, but most fossils are found in sedimentary rock.
The Petrified Wood formed when a tree died and was buried by sediments.
Minerals in the groundwater then permeated the wood, replacing the original organic matter and turning it to stone.
The park sprawls over 346 square miles and is one of the richest troves of the late Triassic Period fossils (210 million years old).
It is considered one of the most important Petrified Wood areas in the world.