Fossilized Leaf (IMAGE) University of Arizona Caption This is a fossilized leaf of Vitis stantonii, a grapelike plant from the Hell Creek Formation in North Dakota. Blonder is especially interested in the venation network of each leaf, because veins may be a very good proxy for temperature via their role in constraining leaf water usage. "Fortunately many fossils have exquisite preservation of veins," he said. Credit Benjamin Blonder Usage Restrictions This visual may only be used in conjunction with reporting/posting of this news release. Image/video credit must be included exactly as indicated. 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.