Icelandic Basalt Pillars: Made by Mythic Trolls? (image) American Geosciences Institute Share Print E-Mail Caption This is the exterior of a freestanding individual basalt pillar. Credit Tracy Gregg Usage Restrictions Please contact email@example.com for usage details. 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.