Petrified Triassic Conifer

January 18, 2024


Photographer: Stan Wagon 

Summary Author: Stan Wagon 

Shown above is a single Triassic conifer that resides at Onyx Bridge, near Lithodendron Creek, in Petrified Forest National Park. It’s approximately 75 ft (23 m) long and perhaps 3 ft (1 m) in diameter. Petrification likely occurred when it was washed into a flood plain by a flash flood and then covered by a mantle of silt that in places reached 1,000 ft (305 m) deep. The conifer’s cellulose was replaced over time by minerals that leached into it. Photo taken in October 2023.


Lithodendron Creek, Petrified Forest National Park, Arizona Coordinates: 34.909988, -109.806793

Related Links:

Petrified Forest