The extraordinary beauty of the Finger Lakes region is well known to its residents and to the many tourists who explore it each year. What is not so well known is the region's unique geology. Its distinctive features are the results of a singular combination of structural units and forces that operated thousands of years ago, when successive advances of the Ice Age continental glaciers thrust their fronts against escarpments extending across their path and into pre-glacial valleys. How these escarpments affected the flow of ice and how the glacial invasions remodeled the entire region is...