A climatic sequence from two Nevada caves

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Abstract
Fishbone and Guano caves, Pershing County, cut in granite by pluvial Lake Lahontan, were exposed for animal and human occupation about the time of the Two Creeks interstadial. Aside from the usual irregularities due to habitation, modern disturbance has made it impossible to secure continuous stratigraphy in the samples furnished by P.C. Orr. However, by combining radiocarbon dates and study of the sediments as well as statistical analysis of the included pollen, a profile consonant with known climatic history since about 15,000 years B.P. has been obtained. A climax of aridity occurred between 6000 and 7000 B.P. shortly following the undoubted evidence of Pleistocene horse and camel. A less extreme aridity developed about 3200 B.P. Interesting evidence of climatic change before 15,000 is present, but its chronology must await study of cores from the sediments of Lake Winnemucca.

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