Explain how palynology can be used to reconstruct past environments. What will be an ideal response?

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Spores and pollen are extremely useful to geologists..Plants are not particularly as common
as fossils, but spores and pollen, which are extremely resistant to decay, deposited in both
marine and continental environments, occur in tremendous numbers, part of the life cycle of
plants, are frequently the only fossils found in outcrops or cores.
Fossil spores and pollen are useful in determining past environments and climates. Their
presence in sedimentary rocks helps palynologists determine what plants and trees were
living at the time, even if the fossils of those plants and trees are not preserved. Plants are
very sensitive to climatic changes, and by plotting the abundance and types of vegetation
present, based on their preserved spores and pollen, palynologists can determine past climates
and changes in climates through time. Many fossil spores and pollen have narrow time
ranges, which makes them excellent guide fossils, and can be used to determine relative
geologic age of sedimentary rocks.