Petroglyphs (IMAGE) University of Pennsylvania Caption This is a photograph of petroglyphs photographed during research conducted in the Lesser Antilles by Theodore Schurr of the University of Pennsylvania, Jada Benn Torres of Notre Dame, and others. Credit University of Pennsylvania Usage Restrictions Must include credit information. 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.