Detailed studies of the composition and origin of the glacial till in the Mexico and Kasoag quadrangles were made in 1938 and 1939. Mechanical analyses were made and pebble samples and heavy minerals were studied. These studies show that the till was derived almost exclusively from the underlying Oswego and Medina sandstones. The orientation of the long axes of hills and pebble distribution indicate an initial encroachment of ice from the NE. and a later encroachment from the NW. The boundary between the till-mantled Oswego and Medina sandstones is extrapolated on the basis of pebble analyses and scanty outcrop data.

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