Glacial stratigraphy from the Thunder Bay lowland, northwest Ontario, indicate glaciolacustrine deposition prior to and after a Superior Lobe advance. Rhythmites present below and above Superior Lobe diamicton indicate ~300 years of glaciolacustrine sedimentation prior to the advance and at least 160 years of glaciolacustrine sedimentation when the Superior Lobe was at the Marks Moraine. This varve chronology, coupled with new radiocarbon dates from northwest Ontario, indicate: i) the Rainy Lobe stood at the Brule Creek Moraine at ~10,200 14C yrs BP fronted by glacial Lake O'Connor in the western Thunder Bay lowland; ii) the Superior Lobe advanced westward into Lake O'Connor between ~9.9 and ~9.7 14C yrs BP; iii) glacial Lake Kaministiquia occupied the reentrant between the Marks and Dog Lake Moraines between ~9.7 and ~9.5 14C yrs BP; and iv) the Superior Lobe retreated from the Marks Moraine after ~9.5 14C yrs BP, fronted by a glacial lake.
|School:||The University of Toledo|
|School Location:||United States -- Ohio|
|Source:||MAI 57/05M(E), Masters Abstracts International|
|Keywords:||Glacial chronology, Lake superior basin, Marks moraine, Northwest ontario, Rainy lobe, Superior lobe|
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