Wang Bo, a researcher with the Nanjing Institute of Geology and Palaeontology of the Chinese Academy of Sciences (NIGPAS), demonstrates a picture of the first known amber encasing an ancient sea animal called ammonite during a press conference in Nanjing, east China's Jiangsu Province, May 14, 2019. An international group led by Chinese scientists identified the first known amber encasing an ancient sea animal called ammonite about 100 million years ago. The study published on Monday in the Proceedings of the National Academy of Sciences described the 6.08 gram amber, which is 33 mm long, 9.5 mm wide and 29 mm high. The discovery provided a clue to ancient coastal forest ecology. (Xinhua/Sun Can)