Ledyard is among the areas of the United States that was covered by a continental ice sheet during the last Ice Age. Therefore, Ledyard has its share of interesting glacial geology. The glaciers that covered Ledyard carried the many large boulders that litter the town. The town has set aside land designated as a "Glacial Park" which consists of a section of end moraine and outwash deposits (containing kettles). This area encompasses a segment of the "Ledyard Moraine"—a clast-supported boulder deposit that is anomalous in nature. Examples of glacial erratics in Ledyard: