Late Holocene history of Waldsea Lake,Saskatchewan, Canada |
| |
| Authors: | William M Last Timothy H Schweyen |
| |
| Institution: | Department of Earth Sciences, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada |
| |
| Abstract: | The post-Hypsithermal history of Waldsea Lake, a saline meromictic lake located in south-central Saskatchewan, has been deduced from a study of the changes in physical, mineralogical, and paleobiological parameters in sediment cores from the basin. Six lithostratigraphic units and three palynological zones are identified in the most recent sediment. These units and zones indicate that a shallow hypersaline lake with extensive mudflats existed about 4000 yr B.P. In response to the subsequent trend toward a cooler and wetter climate, deeper water conditions ensued, and by about 3000 yr ago a relatively deep stratified lake occupied the Waldsea Basin. A short climatic reversal about 2500 yr B.P. again caused low-water and mudflat conditions, but by 2000 yr ago the lake had regained its higher levels. The past 2000 yr of Waldsea's history have been relatively uneventful, except for a minor lowering of the lake about 700 yr B.P. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
