Arizona Petrified Wood: This ancient forest in Arizona is the second largest in the world, with the Madagascar deposit being the oldest. The Arizona Petrified Forest is 200 million years and Madagascar is closer to 220 million. This magnificent Arizona Forest once sat much closer to the equator but shifted to its present position as the land mass known as Pangaea broke up and parts shifted north. The forest is now located near the town of Holbrook in Northern Arizona and is a popular attraction to millions of visitors each year. It is a strewn about the desert landscape and blazing rainbow colors in the sunlight. For obvious reasons this fossil wood is also called "Rainbow Wood."