後冰期指示氣候之化石花粉之簡索表

An Illustrated key to some Fossilized Post Glacial, Climatic Indicator Pollens

Modern pollen analysis began in 1916 with the paper by the Norwegian L. Von Post (1916). On the American side, recent work has been done by Sears (1942-64), Potzger (1941, 1956), Voss (1933), Cain (1939-44), Deevey (1957), Hanson (1947) and Wilson (1943). Much of this work has had as its objective the identification of Post Wisconsin climatic periods from stratified fossil pollen deposits accumulated in bogs and lakes. Since these bogs and lakes in the northern part of North America were established at the time of the retreat of the continental glacier, climatic periods prior to the glaciation can not be defined. In the Southern United States and Valley of Mexico (both areas free of the Wisconsin ice sheet) work by Sears (1955, 1961) has more or less established some climatic sequence for the Pleistocene in North America.