Summary
A bioRxiv preprint reports that UV and laser light reveal leaf venation and shape invisible under white light in about half of the fossil leaves surveyed. The authors say the images could improve fossil identification and support future AI-based analysis.
A bioRxiv preprint reports that ultraviolet and laser illumination reveal detailed leaf veins and overall shape in about 50% of the fossil leaves examined across a survey of fossil deposits. The authors say these features are invisible under white light and call the newly revealed details “Fossil Ciphers.”
Fossil leaves are common, but preservation can leave too little visible detail for confident identification. That limits researchers’ ability to place specimens in evolutionary context or use them in ecological and past-climate reconstructions. The preprint proposes fluorescence imaging as a way to recover useful anatomical detail from some of these specimens.
What fluorescence could add to fossil analysis
Fluorescence occurs when a material absorbs light energy and emits light. In this study, the authors report that UV and laser illumination made venation—the pattern of veins within a leaf—as well as broader leaf morphology visible where white-light viewing did not reveal them. Such features can help distinguish fossil leaves and provide measurements for quantitative comparisons.
The authors say the images could support taxonomic classification and quantitative morphometrics, the measurement and comparison of form. They also describe them as a promising basis for incorporating artificial intelligence into fossil-leaf analysis. The preprint presents AI as a potential next step; its abstract does not report a completed AI classifier or its performance.
The work is posted as a preprint on bioRxiv. Its abstract reports the approximate share of leaves that fluoresced, but does not give the survey’s sample count or imaging protocol, details needed to judge how broadly the result applies.