Columnar Basalt (IMAGE) Arizona State University Caption Columnar basalt from the Siberian flood basalts on an island in the Angara river, south of the volcaniclastics province. Left to right: Scott Simper, Lindy Elkins-Tanton, Sam Bowring, Seth Burgess and Ben Black. Credit Scott Simper Usage Restrictions with credit 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.