Fall foliage transformation (IMAGE) University of New Hampshire Caption Leaves of a red oak captured around the time show how different layers of the tree canopy can develop at different times, with the outer layer usually changing first. Credit University of New Hampshire Extension 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.