This Specimen has been sold.
Petrified Wood - Limb Slice From Madagascar
This a slice of a petrified tree limb mined near Ambilobe, Madagascar. It's about 2 inches in diameter and 3/4 of an inch thick. One side has been highly polished to reveal all of the detail such as the tree rings. This petrified wood is from the Early Triassic period or approximately 220 million years old, making it some of the oldest petrified wood available.
Petrified wood is the name given to wood that has been turned into stone (fossilized) through the process of permineralization. All of the organic matter becomes replaced by minerals, while much of the original structure such as tree rings in retained. For this to happen the wood needs to be buried in an environment both low in oxygen (preventing decomposition) and with flowing, mineral-laden water. The coloration is due to the various minerals that are present during fossilization. For example red colors are due to iron compounds, greens due to copper, etc.