Tides during the Late Silurian (IMAGE) Uppsala University Caption A tidal simulation for the Late Silurian, with the colors depicting varying tidal ranges in meters for two tidal constituents. The first being the semi-diurnal (twice a day) lunar constituent (A-C), and the semi-diurnal (twice a day) solar constituent (D-F). Enlarged areas of evolutionary interest are shown in (B) and (E) for the South China region and (C) and (F) for Laurussia. Note the large tidal ranges seen around the South China region, the area where the first bony fish appeared. Credit Mattias Green/Bangor University Usage Restrictions This image may be used when reporting of research made by Mattias Green 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.