The area is thought to have been a river deposit during the Late Triassic period
5 Arran - Huge reptilian footprints from the Triassic period
have been found.
During 200 million years ago in the Upper Triassic period
of the now Petrified Forest, ran water, producing a chemical reaction facilitating the decay of logs and bones; that water, picked up also as sediment, traces of silicon, which combined with oxygen.
Plateosaurus Lived during the Triassic period
; it ate only plants.
As the show opens, a friendly palaeontologist tells us about plate tectonics and the differences in the Earth's atmosphere at the start of the Triassic period
These bones are from the Upper Triassic period
, and are approximately 200-210 million years old.
"Finds like this reinforce the importance of Petrified Forest in helping to drive global research on the Late Triassic Period
and the very origins of dinosaurs."
Edward Timothy (Tim) Tozer, who died in Vancouver, B.C., on 26 December 2010 at age 82, was a world authority on the paleontology and geology of the Triassic Period
(250-200 million years ago).
Dinosaurs first appeared around 230 million years ago during the Triassic period
, but they were not the giant creatures whose names are now familiar to us all.
He also added, "This type of bone structure is not thought at that time for the predatory dinosaurs." The oldest known dinosaurs lived 230 million years ago, in the Triassic Period
. After that, there is a big gap from fossil findings.
But the Triassic period
extended from 250 to 200 million years ago, followed by Jurassic, which spanned from 145 to 200 million years.
The first dinosaurs appeared in the Triassic period
almost 220 million years ago, developing through the Jurassic period 150 million years ago and into the Cretaceous period 127 million years ago.