Synchrotron scanning reveals hidden pigmentation patterns in Eocene fossil fish

Using advanced synchrotron X-ray fluorescence, researchers have detected remnants of melanin pigmentation in a 50-million-year-old fossil fish from the Green River Formation. The technique revealed that the fish had countershading coloration similar to modern marine fish. This is the first time such detailed color reconstruction has been possible for a Green River Formation specimen. The method opens new possibilities for studying the evolution of coloration and camouflage strategies in prehistoric marine ecosystems.