Macrophotograph of the structural detail in a piece of fossilized wood (Araucarioxylon arizonicum) from Arizona; late Triassic (approx. 225 million years) in age; the state fossil of Arizona; an extinct conifer Image #4001 4080 X 6144 pixels
An extinct marine invertebrate found in Morocco. Existed during the Cretaceous period. During fossilization the shell was replaced by an iron compound Image #2190 3200 X 4800 pixels
