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Post-Mazama Natrargids in Dixie Valley, Nevada¹

ABSTRACT

Some of the youngest Natrargids in central Nevada are in basin-fill containing volcanic ash. South of the salt flat in Dixie Valley they are associated with Torrifluvents and Torriorthents in a continental climate with mean temperatures about 12 to 14°C and mean annual precipitation between 10 and 15 cm. Since there are lenses of Mazama ash below the natric horizons in some of these Natrargids, they are know to be < 6,600 radiocarbon years old.

A representative Typic Natargid in silty post-Mazama basin-fill sediments is described. Illuviation is confirmed by clay skins in the natric horizon. The present precipitation is adequate to account for its development.

¹ Contribution of the Agric. Exp. Stn., Univ. of Nevada, Journal Ser. no. 323, and the Soil Survey Investigations Unit, USDA-SCS, P. O. Box 672, Riverside, CA 92502. Presented 31 July 1974 at the third biennial meeting of the American Quaternary Association, Madison, Wis.

² Former Associate Soil Scientist, Univ. of Nevada, Reno (now Soil Scientist, USFS, 630 Sansome St., San Francisco, CA 94111), and Research Soil Scientist, USDA-SCS, Lincoln, Neb.

Received for publication February 16, 1977. Accepted for publication June 27, 1977.