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This report summarizes the results of three case studies where dendrochronology was used to evaluate hydrologic and geomorphic change in parts of Tully Valley, in central New York, over the past 150 years. The case studies evaluate 1) the changes in water quantity and quality in a wetland area several miles north of an area of former solution-brine mining, 2) the development of recent bedrock fractures above former solution brine-mining areas, and 3) the development and timing of landslide movement. The advantage of contemporary dendrochronology is that tree-ring analysis can provide a background of hydrologic and geomorphic change when no direct documentation or data are available.