Obsidian blade (IMAGE) Southern Methodist University Caption A small piece of obsidian, just over 5 centimeters long, likely found on a hard-scrabble piece of ranchland in the Texas panhandle. Credit SMU Usage Restrictions None 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.