Palynology exists as a study obviously because palynomorphs can be found in the rock record.  But why are palynomorphs so abundant (up to 5 million cells per gram in organic marine and coal deposits) in some samples?   Why are pollen and spores preserved more easily than other plant parts?  Here are some answers:

• Palynomorphs are present in every kingdom, except Monera.
• Palynomorphs are preserved in rocks that aren't necessarily fossiliferous.
• Harder exterior than other parts, therefore resist deterioration more successfully.
• Minute sizes make them more prone to transportation as sediments.
• Diverse variations in shapes and forms - many palynomorphs can be named and studied.
• In the case of pollen and spores, strength in numbers; millions of cells are produced to improve chances of reproduction.

        Even with all the above criteria working in favour for preservation, palynomorphs aren't as readily available as palynologists would like.  In fact, there are restrictions that are unfavourable for restoration.  According to Traverse, palynomorphs will oxidize when exposed to weathering and they can not survive in high-alkaline areas (1988).  Obviously, due to their susceptibility to extreme conditions, palynomorphs can't be found in metamorphic or recrystallized rocks (Traverse, 1988).  Even in modern times it is difficult to match strayed pollen and spores to the species of plant which it originated from; imagine the difficulty palynologists have matching fossilized palynomorphs to the species - some of which may not exist anymore.