Skip to main content
U.S. flag

An official website of the United States government

Late Pleistocene and Holocene paleolimnology of two mountain lakes in western Tasmania.

January 1, 1986

The analysis of diatoms from two lake-sediment cores from southwestern Tasmania that span the Pleistocene-Holocene boundary provides insight about paleolimnological and paleoclimatic change in this region. Both Lake Vera and Eagle Tarn have lacustrine records that begin about 12 000 yr ago. Both lakes have had similar limnological histories. Each appears to have been larger and more alkaline 12 000 yr ago and both became shallower through time. Fossil diatom assemblages about 11 000 yr old indicate shallow- water environments that fluctuated in pH, and between dilute and possibly slightly saline hydrochemical conditions. Beginning 11 500 yr ago, limnological conditions of shallow, dilute water of neutral pH prevailed, indicating reduction of moisture stress. A subsequent transition to diatom assemblages indicative of acidic conditions about 10 000 yr ago parallels the establishment of rain-forest vegetation and essentially modern climatic conditions with excess precipitation over evaporation. Changes at these separate and distinctive sites suggests a regional paleoclimatic cause rather than local environmental effects. Latest Pleistocene climates were apparently more continental and drier than Holocene climates in southwestern Tasmania.-from Author

Citation Information

Publication Year 1986
Title Late Pleistocene and Holocene paleolimnology of two mountain lakes in western Tasmania.
Authors Bradbury J. Platt
Publication Type Article
Publication Subtype Journal Article
Series Title Palaios
Index ID 70014531
Record Source USGS Publications Warehouse