The artist studying the composition of a 251 000 000 years old petrified tree in Arizona, following the steps of R.L. Stevenson, who met there with Petrified Charlie in 1880... In fact, rather watching the trees than studying them. I don't know how to study a tree. By counting the annual growth rings? But these trees dont have 251 000 000 rings, while being 251 000 000 years old. As usual, science is wrong... By the way, how large would be a 251 000 000 years old tree?