OCR Text |
Show arid setting) was the first to record sedimentary evidence of this change. The order in which these lakes first recorded evidence of impending climate change is in accord with theory, but there are large gaps between the times that the first and second basins recorded those climate changes in their sediments- gaps of 5 ky, 20 ky, and 100 ky. This appears to mean that climate changes required greatly different periods of time. The variation in the magnitude of these delays means that paleoclimatic histories based on pluvial lakes in multiple- basin settings, such as the Owens River chain, Lake Bonneville, and Lake Lahontan, must carefully evaluate the hydrologic settings of the basin( s) from which the ages of climate changes are inferred. July 21,1997 9: 15 2 |