Soil profile (IMAGE) American Society of Agronomy Caption The Tuxekan soils are organic and metal-colloid rich Spodosols that have formed on alluvial terraces in the riparian zones of southeast Alaskan streams. Credit David D'Amore Usage Restrictions For use with story only. 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.