Novillo Figure 1 (image) University of Heidelberg Share Print E-Mail Caption Basaltic dykes with a newly determined Age of 619 Million years in Novillo Gneiss, Tamaulipas (Mexico). Dark grey dykes cut whitish gneiss in centre of image. Credit Source: Bodo Weber (CICESE) Usage Restrictions This image may be used only in connection with the contents of this press release, and the source of the image must also be cited. Share Print E-Mail 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.