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Improved dating methods have increased our ability to more
precisely determine the timing and durations of glaciations.
Utilizing glacial and loess deposits, we have compared glaciations
that occurred in North and South America in order to determine if
events are synchronous or not, to explore forcing mechanisms, and
to compare glaciations with cold periods of the Marine Oxygen
Isotope stages and the loess/paleosol records of China.
Stratigraphic sections containing a variety of glacial deposits,
some with interbedded volcanics, as well as loess deposits, were
used in reconstructing the glacial history. The Late Pleistocene
(Brunhes Chron) Last Glacial Maximum is recognized in mountain and
continental areas of North America but only in the mountains of
South America. Commonly our comparisons indicate roughly
synchronous glaciations on the two continents, whereas other
glaciations are more elusive and difficult to compare. Although our
comparisons are at low resolutions, the results suggest that
Milankovitch forcing is most likely the dominant trigger for
hemispheric glaciation modified by local factors.
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