Tusk_detail.jpg (IMAGE) University of Alaska Fairbanks Caption A close-up view shows a split mammoth tusk at the Alaska Stable Isotope Facility. Blue stain is used to reveal growth lines. Samples were taken along the tusk using lasers and other techniques, allowing isotope analysis that provided a record of the mammoth’s life. Credit Photo by JR Ancheta, University of Alaska Fairbanks Usage Restrictions Credit photographer License Original 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.