Composite Skull? (IMAGE) University of Kansas Caption Is this Microraptor skull a composite? (A) The skull under white light shows subtle color differences. (B) Under laser-light stimulation, the bone fluoresces from differences in fossil mineralogy, indicating the skull is likely a composite. Credit KU News Service/University of Kansas Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.