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Geomorphology of a Glaciated First-Order Valley in South Central New York¹

ABSTRACT

A glaciated first-order valley in south central New York was studied to determine the post-glacial evolution of the landforms. Ninety-seven profiles were sampled at depth intervals of approximately 30 cm to determine internal features of the landscape units. Particle size differences were the main indicators of lithologic discontinuities. Arithmetic mean of the fine earth particle size in conjunction with the relative amounts and orientation of coarse fragments were useful in determining strata of the summit, shoulder, backslope, footslope, toeslope and the high, intermediate, and low level terraces. Congeliturbate as much as 10 m deep was found in the basin at the head of the stream in foot- and toeslope areas. The downstream portion of these deposits has been deeply entrenched by the stream. During periglacial times congeliturbate in the downstream channel contributed to temporary base levels of the stream. Much of this congeliturbate remains as terraces. The alluvium resulting from the entrenchment of the congeliturbate occurs as a series of 92 terrace remnants and it is believed that their strata, relative elevation, and gradient contain clues to the complex sequence of erosional and depositional events.

¹ Contribution from the Dept. of Agronomy, New York State College of Agriculture and Life Sciences, Cornell Univ., Ithaca, N.Y. 14853. Agronomy Paper no. 1090. The findings are in part based on a joint M.S. thesis by the two senior authors. Presented before Div. S-5, Soil Science Society of America, 11 Nov. 1974, Chicago, Ill.

² Research Assistant, former Research Assistant, and Associate Professor of Soil Science, respectively. W. E. Hanna is currently a Soil Scientist, SCS-USDA, Morrisville, N.Y.

Received for publication August 26, 1974. Accepted for publication March 3, 1975.