Paleontologists in Brazil have found thin bands of fossil gum — the first occurrence in the fossil record — inside 110-million-year-old (Cretaceous period) fossilized leaves of the extinct plant Welwitschiophyllum brasiliense. The discovery of fossilized plant gum is unusual because of its solubility in water. Orange-colored gum ducts (arrows) in the brown leaf tissue of Welwitschiophyllum brasiliense from the Crato Formation, Brazil....
