Glacial Moraine Glacial Moraine Glacial moraine consists of soils formed over sandy glacial till and generally of the steeper soils formed over water-sorted sand and gravel.
Glacial moraine is as much a landform designation as a geologic designation.
The moraines are the hilly parts of Suffolk County, and the topography is characteristically that of many hills and depressions. Since the engineering properties of the course-grained sand and gravel arenot very different, regardless of geologic origin, their engineering characteristics are determined to a large degree by their topographic differences. Among the differences between the till and outwash is the amount of fines in the soil. This generally decreases permeability, decreases conmpressability, and increases the strength of the soils. Boulders and cobblestones are also scattered throughout the soil.