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Petrified Forest National Park, about 100 miles east of Flagstaff off I-40, is centered around what is believed to be the world's largest concentrations of petrified wood, dating from some 225 million years ago.
Word of the Day
- A transitional zone between two communities containing the characteristic species of each.
The word 'ecotone' comes 'eco-' plus a Greek root meaning 'tension'.