Inside Arizona’s 225-Million-Year-Old Petrified Forest Arizona’s Petrified Forest contains colorful fossil wood from the Late Triassic, when giant river system

Inside Arizona’s 225-Million-Year-Old Petrified Forest Arizona’s Petrified Forest contains colorful fossil wood from the Late Triassic, when giant river systems crossed the region. Some logs are now almost entirely replaced by quartz [📷](https://pbs.twimg.com/media/HTLAVf4W0AATy35.jpg) [📷](http…