Abstract

A paleomagnetically dated core through the basin floor near Great Salt Lake reveals a remarkably complete Pleistocene and late Pliocene continental record. The Blake event, the Brunhes-Matuyama boundary, and the Bishop and Pearlette “O” ashes provide time lines in the upper third of the core. The Bishop ash is found to be about 15,000 yrs younger than the Brunhes-Matuyama boundary. During the last 800,000 yrs, about 28 episodes of subaerial exposure interrupted lacustrine deposition at the core site. Comparison with a composite central European loess section and several deep-sea cores shows good correlation of inferred climatic fluctuations at the Brunhes-Matuyama boundary and in the late Brunhes, but not in the early Brunhes.

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