Fossilized section of Callixylon trifilievii, the oldest known true wood. Upper Devonian-Frasnian Stage (approx 380 million years ago). From the St. Petersburg Region, Russia. Image #3749 4800 X 3200 pixels
Macrophotograph of the structural detail in a piece of polished petrified wood (Species: Araucaria, a conifer, from the Early Triassic, approx 220 million years ago; Madagascar) Image #3769 6144 X 4080 pixels
Closeup photograph of the structural detail in a piece of fossilized wood (Araucarioxylon arizonicum) from the Chinle Formation in Arizona; late Triassic (approx. 225 million years) in age; the state fossil of Arizona; an extinct conifer Image #4128 4080 X 6144 pixels
