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In 1916, Swedish geologist Ernst Jakob Lennart von Post delivered a provocative lecture in Oslo, Norway, advocating the use of pollen grains in bog sediments as indicators of past vegetation and climate.

The lecture spawned many applications and represents a landmark in multidisciplinary science.

Grass pollen is what afflicts nearly all Irish victims of hayfever, but a glad immunity lets me off their misery.

For me, "pollen count" has quite a different significance - one that takes me travelling to the past.

Investigators estimated that the unidentified girl, “Baby Doe,” was about 4 years old.

Among the clues found at the scene: pollen on the child’s pants and blanket. The Boston police contacted the National Center for Missing & Exploited Children (NCMEC), and asked if pollen analysis of the evidence would be possible. Palynology is the study of pollen grains and other spores.

Combining centrifugations in two Cs Cl solutions, one of higher density and one of lower density than pollen, a pure pollen fraction was successfully prepared.

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The weight of pollen on the anthers of cocksfoot looks enough to bow down this sturdiest of grasses, but a breeze of a mere 10 kilometres per hour is enough to shake out its mass of male gametes and waft them off to find a female flower.

This theory was restated five years later in , in Chapter IX, "Axis Shifted." (esp. 137 ff., "A Working Hypothesis") As its title suggests, the next chapter, "Thirty-five Centuries Ago," is intended to demonstrate that the last glaciation could have ended as late as 3500 years ago, or even later.

First Velikovsky criticizes the Swedish varve chronology and the radiocarbon dating method, predicting that "more and more puzzling' results of radiocarbon tests will compel a full-scale revision of the dating of the glacial periods." Then he enumerates a series of estimates made of the length of time needed to complete various geological processes since the ice retreated to cut the Niagara River gorge, to build the Bear River delta, for the salt to accumulate in various lakes arriving in each case at a figure between 25 years.

Successful processing removes non-pollen material, especially other organic material, to concentrate pollen grains for dating.

Most samples are suitable for dating after processing.

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