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Soil-Geomorphic Relationships in Postglacial Alluvium in New York¹

ABSTRACT

In south-central New York alluvial soils of the three postglacial geomorphic units were correlative between two sites on different size rivers. Noncumulative Inceptisols dominate the higher postglacial terrace. Cumulative soils, with buried A horizons, that are fluventic subgroups of Inceptisols have developed in overbank silts episodically deposited during the past 3,500 years on the lower terrace (high bottom). Significantly less developed soils, but sometimes taxonomically identical, have developed in the oldest portion of the flood plain (low bottom). Weakly structured soils dominate the younger alluvial fills of the flood plain whose sandy lateral accretion deposits are less than 880 ± 130 years B.P. old. The weakly structured soils have remnants of textural stratification and lack color evidence of alteration and are presumably Fluvents.

¹ Contribution from the Department of Agronomy, Cornell Univ., Ithaca, NY 14853. Agronomy Paper no. 1221. Presented before Div. S-5 Soil Sci. Soc. Amer., Los Angeles, Calif., 14 Nov. 1977.

² Former Graduate Research Assistant; presently Graduate Assistant, Dept. of Geological Sci., Univ. of Colorado, Boulder, CO 80302, and Prof. of Soil Science, respectively.

Received for publication January 23, 1978. Accepted for publication June 6, 1979.