Heinrich H1 and 8200 yr B.P. climate events recorded in Hall's Cave, Texas

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Measurements of magnetic susceptibility (MS) have been performed on a continuous set of samples from a well-dated ∼3 m sequence of sediments collected from Hall's Cave, Edwards Plateau, central Texas. Three major climatic events are represented by distinctive MS increases in the sequence: (1) the Heinrich event H1 (from 17,500 to 17,000 yr B.P.); (2) the end of full glacial conditions on the Edwards Plateau at 14,200 yr B.P.; and (3) the 8200 yr B.P. climatic event (from 8250 to 8050 yr B.P.). In addition, a minor event at 4400 yr B.P. is also well defined here and in Canada, indicating that it is a broadly regional event. These data indicate that all four events represent a shift toward milder climatic conditions accompanied by increased rainfall at this location. The general climatic trends interpreted from the MS data are consistent with independent vertebrate assemblages, floral indicators, and isotopic data recovered from the cave. © 2006 Geological Society of America.

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