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Terrace and fan deposits along the Merced River in the San Joaquin Valley, Calif., have been approximately dated and range in age from about O.Z to 3,000 ka. Soils were sampled on nine deposits to establish a soil chronosequence in an area with a Mediterranean climate, grassland vegetation, and sandy granitic parent material. Soil samples were analyzed for several morphologic, chemical, physical, and mineralogic properties, many of which vary systematically with age. Properties showing the most systematic changes over time include: (1) field descriptions of clay films, total texture (texture plus wet consistence), rubification (color hue plus chroma), and dry consistence; (Z) depletion or concentration of Ca, Mg, Na, Fe, Al, and Ti relative to Zr, the most stable constituent; and (3) other physical and extractive-chemical characteristics, including clay mineralogy, dithioniteand oxalate-extractable Fe content, and total (titratable) soil acidity. Changes in soils over the 3,000-ka age span demonstrate that significant chemical differentiation, mineralogic transformations, and morphologic changes occurred as a result of soil development. The high correlation of soil characteristics with age provides a means to use the soils for correlating and dating late Cenozoic deposits.

Soils developed in granitic alluvium near Merced, California