During the summer of 1946 the writer studied the ground‐water resources of Schoharie County, New York, as a part of the program of ground‐water investigation being carried on in cooperation between the United States Geological Survey and the New York State Water Power and Control Commission. Because the outcrop belt of Devonian and Upper Silurian carbonate rocks is wider in Schoharie County than in other parts of the State, the effects of solution on these formations is better displayed here than elsewhere. The conditions described below probably apply on a smaller scale to the areas to the west, where the upper formations are cut out by an unconformity, and to the east in the Helderberg area, where similar effects have been described by Goldring [see “References” at end of paper, 1935]. However, it is probable that solution in the limestones in the Hudson Valley is not comparable because of the folded condition of the rocks.