Tikal (IMAGE) University of Cincinnati Caption UC researchers Nicholas Dunning, left, Vernon Scarborough and David Lentz set up equipment to take sediment samples during their field research at Tikal. Credit Liwy Grazioso Sierra Usage Restrictions None 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.